Fumarole mineral

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Fumarole formation of tazieffite [de] acicular crystals (black) at Mutnovsky, Kamchatka. An electron micrograph, colour enhanced by optical microscopy, depicted width: 700 microns. Tazieffite - Mutnovsky volcano, Kamchatka, Russia (Color SEM).jpg
Fumarole formation of tazieffite  [ de ] acicular crystals (black) at Mutnovsky, Kamchatka. An electron micrograph, colour enhanced by optical microscopy, depicted width: 700 microns.

Fumarole minerals (or fumarolic minerals) are minerals which are deposited by fumarole exhalations. They form when gases and compounds desublimate or precipitate out of condensates, forming mineral deposits. They are mostly associated with volcanoes (as volcanic sublimate or fumarolic sublimate) following deposition from volcanic gas during an eruption or discharge from a volcanic vent or fumarole, [1] but have been encountered on burning coal deposits as well. They can be black or multicoloured and are often unstable upon exposure to the atmosphere.

Contents

Native sulfur is a common sublimate mineral and various halides, sulfides and sulfates occur in this environment associated with fumaroles and eruptions. A number of rare minerals are fumarole minerals, and at least 240 such minerals are known from Tolbachik volcano in Kamchatka, Russia. Other volcanoes where particular fumarole minerals have been discovered are Vulcano in Italy and Bezymyanny also in Russia.

Origin and appearance

Fumarole minerals in SEM images, from Mutnovsky volcano in Kamchatka. An electron micrograph, colour enhanced by optical microscopy, depicted width: 700 microns. Color SEM 4.jpg
Fumarole minerals in SEM images, from Mutnovsky volcano in Kamchatka. An electron micrograph, colour enhanced by optical microscopy, depicted width: 700 microns.

In fumaroles, minerals either form through desublimation from fumarole gases or through interactions of fumarole gases with country rock. [2] The former are known as sublimates and the latter as incrustations. [3] Some such deposits may also form through the interaction between liquid fumarole condensates and country rock [4] and are not always formed by desublimation. [5] Repeated cycles of primary deposition and secondary alteration may occur. [6] Volcanic gases such as hydrogen chloride, hydrogen fluoride, sulfur dioxide and water [7] can transport large amounts of elements, thus contributing to geochemical cycles on the surface and the formation of ore deposits at depth. [8] When these exhalations reach the atmosphere and cool, the minerals contained in them tend to precipitate out. [9]

Volcanic fumarole minerals (as volcanic sublimate or fumarolic sublimate) form following deposition from volcanic gas during an eruption or discharge from a volcanic vent or fumarole. [1] Burning coal produces enough heat to partially melt rocks and to generate exhalations of the mineral components embedded in coal. [10] Coal seam fires often deposit fumarolic minerals over areas of a few square metres which can be detected by airborne hyperspectral imagery. [11] Coal fires can mobilize toxic trace elements. [12] Fumarole minerals have also been found in Gusev crater on Mars. [13]

Fumarole deposits have been used to identify heat flow anomalies and to reconstruct ore genesis processes. [6]

Fumarole exhalations are often black or multicoloured, and tend to develop typical zonations. Common components are sulfur compounds and elemental sulfur. [9] In the Valley of Ten Thousand Smokes in Alaska the fumarole minerals form both thin crusts in the vents, mixtures with tephra deposits [14] and coloured outcrops and mounds at the sites of former fumaroles. [15] Deposits at Tolbachik volcano have shapes likef crusts, small plates [16] and globules. [17]

Typical components of fumarole minerals are halides, oxides, sulfates and sulfides, [18] with the exact composition different between volcanoes, individual vents at volcanoes and different temperatures of the same vent. [19] Fumarolic minerals are often unstable and are eroded or decompose, [20] in the Valley of Ten Thousand Smokes in Alaska it took less than a century for almost all fumarole mineral deposits to disappear [21] although others remained and were later used to identify former fumarole vents. [22] Thus, many fumarole minerals are rare and many rare minerals are fumarole minerals. [23] Some fumarolic minerals have been found in extinct Cenozoic volcanoes [24] and could exist in Archean rocks as well, however. [25] Unique textures occur such as bubble-like structures, which may form when the liquid that deposits the minerals evaporates. [4]

Volcanoes

Electron micrograph images of fumarolic minerals at Mutnovsky volcano, Kamchatka Color SEM 2.jpg
Electron micrograph images of fumarolic minerals at Mutnovsky volcano, Kamchatka

Research on the mineralogy of fumarole minerals has been conducted in Central America, Russia and Europe, [18] with detailed publications on Izalco in El Salvador, [26] Eldfell in Iceland, [27] Vesuvius [19] where research goes back to the early 19th century [28] and Vulcano in Italy, Mount Usu in Japan, Kudryavy and Tolbachik in Russia, Kilauea and Mount St. Helens in the United States. [18] Sulfur deposits containing fumarolic desublimates are found at Guallatiri and Lastarria volcanoes in the Central Volcanic Zone of the Andes. [29] Kudryavy volcano in the Kurils is particularly known for the numerous mineralizations its fumaroles have produced [30] and for the presence of rhenium-rich precipitates. [3] Among the elements found there are copper-gold-silver alloys. [31] Various sulfate-based minerals have been identified at the Salton Buttes in California. [32] Fumarolic minerals have also been reported from the Western Andes in Bolivia. [33]

The most fumarolic minerals have been found at Tolbachik volcano in Kamchatka, Russia; Tolbachik also has one of the most diverse mineral assemblages in the world. [24] The high temperature and oxidizing regime of exhalations which transport the elements at Tolbachik facilitates mineral deposition. [34] A large assemblage of silicates [35] and a number of copper-zinc selenite chlorides [36] and copper-based fumarolic minerals were discovered at Tolbachik volcano, Kamchatka, Russia. Many of these include polymeric CuO
4
units. [2] About 240 minerals have been identified at Tolbachik, [24] close to a record, [37] 40 of them only incompletely studied. [38] Elemental gold linked to chlorides at Tolbachik has been interpreted as gold transported by chlorine-rich oxidizing environments. [39] Specimens of fumarole minerals from Tolbachik and Kudryavy are hosted by the Fersman Mineralogical Museum in Moscow. [40]

Historical lava flows of Vesuvius volcano contain fumarolic minerals. [41] Various fumarole minerals have been discovered at Vulcano volcano in Italy, where the mineralogy has changed since 1987 and 1990 due to hotter fumarole exhalations, [42] yielding increased sulfate and sulfur salt concentrations. [43] Fumarolic minerals have also been encountered in multiple mud volcanoes in Siberia. [44]

Minerals discovered in fumarole areas

MineralFormulaLocationDate describedRef
Abramovite Pb
2
SnInBiS
7
Kudryavy, Russia2008 [45]
AllochalcoseliteCu+
Cu2+
5
PbO
2
(SeO
3
)
2
Cl
5
[46]
AluminocoquimbiteAlFe(SO
4
)*
3
H
2
O
Grotta del' Alume, Vulcano, Italy2010 [47]
Aluminopyracmonite(NH
4
)
3
Al(SO
4
)
3
La Fossa, Vulcano, Italy2018 [48]
ArsmiranditeNa
18
Cu2+
12
Fe3+
O
8
(AsO
4
)
8
Cl
5
Arsenatnaya fumarole, Tolbachik, Russia2020 [2]
AxeliteNa
14
Cu
7
(AsO
4
)
8
F
2
Cl
2
Arsenatnaya fumarole, Tolbachik, Russia2022 [49]
BaliczuniciteBi
2
O(SO
4
)
2
La Fossa, Vulcano, Italy2013 [43]
BelomarinaiteKNaSO
4
Toludskoe lava field, Tolbachik, Russia2019 [50]
BelousoviteKZn(SO
4
)Cl
Yadovitaya fumarole, Second Scoria Cone, Tolbachik, Russia2018 [51]
Blossitea-
Cu2+
2
V5+
2
O
7
Izalco, El Salvador1987 [26]
BubnovaiteK
2
Na
8
Ca(SO
4
)
6
Naboko cone, Tolbachik, Russia [52]
Cadmoindite CdIn
2
S
4
Kudryavy, Russia2004 [53]
CalciolangbeiniteK
2
Ca
2
(SO
4
)
3
Arsenatnaya fumarole, Tolbachik, Russia2022 [54]
Campostriniite(Bi3+
,
Na)
3
(NH,
4
K)
2
Na
2
(SO
4
)·
6
H
2
O
La Fossa, Vulcano, Italy2015 [55]
CannizzaritePb
46
Bi
54
(S
,
Se)
127
La Fossa, Vulcano, Italy [56]
CesiodymiteCsKCu
5
O(SO
4
)
5
Second Scoria Cone, Tolbachik, Russia2018 [57]
ChubaroviteKZn
2
(BO
3
)Cl
2
Arsenatnaya fumarole, Tolbachik, Russia2015 [58]
CryptocalciteK
2
Cu
5
O(SO
4
)
5
Second Scoria Cone, Tolbachik, Russia2018 [57]
CuprodobrovolskyiteNa
4
Cu(SO
4
)
3
Second Scoria Cone, Tolbachik2023 [59]
CupromolybditeCu
3
O(MoO
4
)
2
New Tolbachik scoria cones, Tolbachik, Russia2012 [60]
D'ansiteNa
21
Mn2+
(SO
4
)
10
Cl
Vesuvius and Vulcano, Italy2012 [61]
DemartiniteK
2
SiF
6
La Fossa, Vulcano, Italy2007 [62]
DemicheleiteBiSI and BiSBrLa Fossa, Vulcano, Italy2010 and 2008 [63] [64]
DobrovolskyiteNa
4
Ca(SO
4
)
3
Great Tolbachik fissure eruption, Kamchatka peninsula, Russia2021 [65]
ElasmochloiteNa
3
Cu
6
BiO
4
(SO
4
)
[66]
EldfelliteNaFe(SO
4
)
2
[67]
Ermakovite(NH
4
)(As
2
O
3
)
2
Br
Fan-Yagnob coal deposit, Tajikistan 2022 [68]
GrigorieviteCu
3
Fe3+
2
Al
2
(VO
4
)
Second Scoria Cone, Tolbachik, Russia2015 [69]
Hermannjahnite CuZn(SO
4
)
2
Naboko scoria cone, Tolbachik, Russia2018 [70]
KarpoviteTl
2
VO(SO
4
)
2
(H
2
O)
First Cinder Cone, Tolbachik, Russia2018 [71]
KnasibfiteK
3
Na
4
[SiF
6
]
3
[BF
4
]
La Fossa, Vulcano, Italy2008 [72]
KoksharoviteCaMg
2
Fe3+
4
(VO
4
)
6
Bezymyanny, Russia2015 [69]
Kudriavite(Cd
,
Pb)Bi
2
S
4
Kudryavy, Russia2004 [53]
LehmanniteNa
18
Cu2+
12
TiO
8
(AsO
4
)
8
FCl
5
Arsenatnaya fumarole, Tolbachik2020 [2]
LeonardseniteMgAlF
5
(H
2
O)
2
Eldfell, Heimaey, Iceland2015 [69]
LesyukiteAl
2
(OH)
5
Cl20−
*
H
2
O
First Cone, Tolbachik, Russia2007 or earlier [73]
Lucabindiite (K
,
NH
4
)As
4
O
6
(Cl
,
Br)
La Fossa, Vulcano, Italy2010–2011 [74]
MajzlaniteK
2
Na(ZnNa)Ca(SO
4
)
4
Yadovitaya fumarole, Tolbachik, Russia2019 [75]
MedvedeviteKMnV
2
O
6
Cl
*
(H
2
O)
2
Toludskoe lava field, Tolbachik, Russia2020 [76]
NapoliitePb
2
OFCl
Vesuvius, 1994 rocks2010-2020 [77]
NishanbaeviteKAl
2
O(AsO
4
)(SO
4
)
Arsenatnaya fumarole, Tolbachik, Russia2022 [78]
OskarssoniteAlF
3
Eldfell, Iceland2018 [27]
OzerovaiteNa
2
KAl
3
(AsO
4
)
4
Second Cinder Cone, Tolbachik, Russia2019 [79]
ParadimorphiteAs
4
S
3
Solfatara, Campi Flegrei, Italy2022 [80]
Parageorgbokiiteb-
Cu
5
O
2
(SeO
3
)
2
Cl
2
Yadovitaya fumarole, Tolbachik, Russia2007 [81]
ParascandolaiteKMgF
3
Vesuvius, Italy2014 [82]
ParawulffiteK
5
Na
3
Cu
8
O
4
(SO
4
)
8
Arsenatnaya fumarole, Tolbachik, Russia2014 [83]
Petrovite Na
10
CaCu
2
(SO
4
)
8
Second Scoria Cone, Tolbachik, Russia2020 [17]
PliniusiteCa
5
(VO
4
)
3
F
Tolbachik, Russia2022 [84]
PrewittiteKPb
1.5
Cu
6
Zn(SeO
3
)
2
O
2
Cl
10
Second Scoria Cone, Tolbachik, Russia2013 [36]
PseudolyonsiteCu
3
(VO
4
)
2
New Tolbachik scoria cones, Tolbachik, Russia2011 [85]
PuniniteNa
2
Cu
3
O(SO
4
)
3
Second scoria cone, Tolbachik, Russia2017 [86]
RhabdoboriteMg
12
(V
,
Mo
,
W)
4/3
O
6
[(BO
3
)
6–x
(PO
4
)
x
F
2–x
]
Arsenatnaya fumarole, Tolbachik, Russia2020 [87]
RussoiteNH
4
ClAs3+
2
O
3
(H
2
O)
0.5
Solfatara, Phlegrean Fields, Italy2018 [88]
RyabchikoviteCuMg(Si
2
O
6
)
Arsenatnaya, Tolbachik2023 [89]
SbacchiiteCa
2
AlF
7
Vesuvius, Italy2019 [90]
ShcherbinaiteV
2
O
5
Izalco, El Salvador 1983 [91]
StoiberiteCu
5
V
2
O
10
"Y fumarole", Izalco, El Salvador1979 [92]
Therasiaite(NH
4
)
3
KNa
2
Fe2+
Fe3+
(SO
4
)
3
Cl
5
La Fossa, Vulcano, Italy2014 [93]
Thermessaite(NH
4
)
2
AlF
3
(SO
4
)
La Fossa, Vulcano, Italy2021 [94]
TopsøeiteFeF
3
(H
2
O)
3
Hekla, Iceland2018 [95]
Wulffite K
3
NaCu
4
O
2
(SO
4
)
4
Arsenatnaya fumarole, Tolbachik, Russia2014 [83]
VasilseverginiteCu
9
O
4
(AsO
4
)
2
(SO
4
)
2
Arsenatnaya fumarole, Tolbachik, Russia2021 [96]
WrightiteK
2
Al
2
O(AsO
4
)
2
Second Scoria Cone, Tolbachik, Russia1983 [97]
YavapaiiteKFe(SO
4
)
2
[67]
ZiminaiteFe3+
VO
4
Bezymyanny, Russia2018 [98]
ZincobradaczekiteNaCuCuZn
2
(AsO
4
)
3
Yadovitaya fumarole, Tolbachik, Russia2020 [99]

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<span class="mw-page-title-main">Abramovite</span>

Abramovite is a very rare mineral from the sulfides and sulfosalt categories. It has the chemical formula Pb2SnInBiS7. It occurs as tiny elongated lamellar-shaped crystals, up 1 mm × 0.2 mm in size, and is characterized by its non-commensurate structure.

Urusovite is a rare copper aluminium arsenate mineral with formula: CuAlAsO5. It is a monoclinic-prismatic light green mineral.

<span class="mw-page-title-main">Piypite</span>

Piypite is a rare potassium, copper sulfate mineral with formula: K2Cu2O(SO4)2. It crystallizes in the tetragonal system and occurs as needlelike crystals and masses. Individual crystals are square in cross-section and often hollow. It is emerald green to black in color with a vitreous to greasy luster.

Feodosiyite is a very rare chloride mineral, just recently approved, with the formula Cu11Mg2Cl18(OH)8•16H2O. Its structure is unique. Feodosiyite comes from the Tolbachik volcano, famous for many rare fumarolic minerals. Chemically similar minerals, chlorides containing both copper and magnesium, include haydeeite, paratacamite-(Mg) and tondiite.

Vasilseverginite is a very rare arsenate-sulfate mineral with formula Cu9O4(AsO4)2(SO4)2. Its structure is of a new type. It possesses a typical feature of many minerals of its type locality, the Tolbachik volcano, namely being a salt with oxide anions. However, it is the first Tolbachik copper oxysalt that is both arsenate and sulfate. Vasilseverginite is monoclinic, with space group P21/n.

Chrysothallite is a rare thallium-bearing chloride mineral with the formula K6Cu6Tl3+Cl17(OH)4•H2O. Chrysothallite is unique in being only the second mineral with essential trivalent thallium, a feature shared with natural thallium(III) oxide, avicennite. Another examples of natural thallium chlorides are steropesite, Tl3BiCl6, and lafossaite, TlCl. Chrysothallite is one of numerous fumarolic minerals discovered among fumarolic sites of the Tolbachik volcano, Kamchatka, Russia The mineral is named in allusion to its colour and thallium content.

Itelmenite is a rare sulfate mineral with the formula Na4Mg3Cu3(SO4)8. It is one of many fumarolic minerals discovered on the Tolbachik volcano.

Hermannjahnite is a rare sulfate mineral with the relatively simple formula CuZn(SO4)2. It is one of many fumarolic minerals discovered on the Tolbachik volcano.

Kainotropite is a rare vanadate mineral with the formula Cu4FeO2(V2O7)(VO4). It contains trivalent iron. It is one of many fumarolic minerals discovered on the Tolbachik volcano. The name of its parental fumarole is "Yadovitaya", which means poisonous.

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