Tlalocite

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Tlalocite
Tlalocite-130808.jpg
Tlalocite spherules from Bambollita Mine (Oriental Mine), Moctezuma, Mun. de Moctezuma, Sonora, Mexico (picture width: 3 mm).
General
Category Mineral
Formula
(repeating unit)
Cu10Zn6(TeO4)2(TeO3)(OH)25Cl · 25 H2O
IMA symbol Tia [1]
Strunz classification 7.DE.20
Dana classification33.3.2.1
Crystal system Orthorhombic
Unknown space group
Unit cell a = 16.78, b = 19.985
c = 12.069 [Å], Z = 4
Identification
ColorCapri blue, green in transmitted light
Crystal habit Velvety crusts or spheres, arced bands
Fracture Sectile, curved shavings or scrapings
Tenacity Gummy and sectile
Mohs scale hardness1
Streak Pale blue
Diaphaneity Translucent
Specific gravity 4.55 (measured) 4.58 (calculated)
Optical propertiesBiaxial (-)
Birefringence δ = 0.052
Pleochroism Green, bluish green
2V angle 64
Ultraviolet fluorescence none
Solubility Insoluble
References

Tlalocite is a rare and complex tellurate mineral with the formula Cu 10 Zn 6(Te O 4)2(Te O 3)(O H)25 Cl · 27 H2O. It has a Mohs hardness of 1, and a cyan color. It was named after Tlaloc, the Aztec god of rain, in allusion to the high amount of water contained within the crystal structure. [2] [3] It is not to be confused with quetzalcoatlite, which often looks similar in color and habit.

Occurrence

Tlalocite was first identified in the Bambollite mine (La Oriental), Moctezuma, Municipio de Moctezuma, Sonora, Mexico and it was approved by the IMA in 1974. It often occurs together with tenorite, azurite, malachite and tlapallite. It is found in partially oxidized portions of tellurium-bearing hydrothermal veins. [4] [5]

Related Research Articles

Erythrite Hydrated cobalt arsenate mineral

Erythrite or red cobalt is a secondary hydrated cobalt arsenate mineral with the formula Co
3
(AsO
4
)
2
•8H
2
O
. Erythrite and annabergite, chemical formula (Ni
3
As
4
)
2
•8H
2
O
, or nickel arsenate form a complete series with the general formula (Co,Ni)
3
(AsO
4
)
2
•8H
2
O
.

Adamite

Adamite is a zinc arsenate hydroxide mineral, Zn2AsO4OH. It is a mineral that typically occurs in the oxidized or weathered zone above zinc ore occurrences. Pure adamite is colorless, but usually it possess yellow color due to Fe compounds admixture. Tints of green also occur and are connected with copper substitutions in the mineral structure. Olivenite is a copper arsenate that is isostructural with adamite and there is considerable substitution between zinc and copper resulting in an intermediate called cuproadamite. Zincolivenite is a recently discovered mineral being an intermediate mineral with formula CuZn(AsO4)(OH). Manganese, cobalt, and nickel also substitute in the structure. An analogous zinc phosphate, tarbuttite, is known.

Kinoite

Kinoite is a light blue copper silicate mineral. It is somewhat scarce. It has a monoclinic crystal system, vitreous luster, and is transparent to translucent. It can be found in the Santa Rita Mountains, the Christmas Mine at Christmas, Arizona and a few other copper mines. Kinoite is popular with mineral collectors. Kinoite was named upon its discovery in 1970 after the pioneer Jesuit missionary Padre Eusebio Kino who worked in Arizona, Sonora and Baja California.

Fraipontite

Fraipontite is a zinc aluminium silicate mineral with a formula of (Zn,Al)3(Si,Al)2O5(OH)4.

Legrandite

Legrandite is a rare zinc arsenate mineral, Zn2(AsO4)(OH)·(H2O).

Cesbronite

Cesbronite is a copper-tellurium oxysalt mineral with the chemical formula Cu3Te6+O4(OH)4 (IMA 17-C). It is colored green and its crystals are orthorhombic dipyramidal. Cesbronite is rated 3 on the Mohs Scale. It is named after Fabien Cesbron (born 1938), a French mineralogist.

Aheylite

Aheylite is a rare phosphate mineral with formula (Fe2+Zn)Al6[(OH)4|(PO4)2]2·4(H2O). It occurs as pale blue to pale green triclinic crystal masses. Aheylite was made the newest member of the turquoise group in 1984 by International Mineralogical Association Commission on New Minerals and Mineral Names.

Hodgkinsonite

Hodgkinsonite is a rare zinc manganese silicate mineral Zn2MnSiO4(OH)2. It crystallizes in the monoclinic system and typically forms radiating to acicular prismatic crystals with variable color from pink, yellow-red to deep red. Hodgkinsonite was discovered in 1913 by H. H. Hodgkinson, for whom it is named in Franklin, New Jersey, and it is only found in that area.

Duftite Arsenate mineral

Duftite is a relatively common arsenate mineral with the formula CuPb(AsO4)(OH), related to conichalcite. It is green and often forms botryoidal aggregates. It is a member of the adelite-descloizite Group, Conichalcite-Duftite Series. Duftite and conichalcite specimens from Tsumeb are commonly zoned in color and composition. Microprobe analyses and X-ray powder-diffraction studies indicate extensive substitution of Zn for Cu, and Ca for Pb in the duftite structure. This indicates a solid solution among conichalcite, CaCu(AsO4 )(OH), austinite, CaZn(AsO4)(OH) and duftite PbCu(AsO4)(OH), all of them belonging to the adelite group of arsenates. It was named after Mining Councilor G Duft, Director of the Otavi Mine and Railroad Company, Tsumeb, Namibia. The type locality is the Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia.

Anthonyite

Anthonyite is a hydrous secondary copper halide mineral with chemical formula of Cu(OH,Cl)2•3(H2O).

Emmonsite

Emmonsite, also known as durdenite, is an iron tellurite mineral with the formula: Fe2(TeO3)3·2(H2O). Emmonsite forms triclinic crystals. It is of a yellowish-green color, with a vitreous luster, and a hardness of 5 on the Moh scale.

Utahite

Utahite is an extremely rare secondary copper zinc tellurate mineral found as a product of oxidation. Its chemical formula is Cu5Zn3(Te6+O4)4(OH)8•7H2O.

Kostovite

Kostovite is a rare orthorhombic-pyramidal gray white telluride mineral containing copper and gold with chemical formula AuCuTe4.

Ilirneyite is a rare tellurate mineral with the formula Mg0.5[ZnMn3+(TeO3)3]•4.5H2O. It was discovered at the Sentyabr'skoe deposit (of silver and gold) in the Ilirney Range, Western Chukotka, Russia.

Tlapallite

Tlapallite is a rare and complex tellurate mineral with the chemical formula (Ca,Pb)3CaCu6[Te4+3Te6+O12]2(Te4+O3)2(SO4)2·3H2O. It has a Moh's hardness of 3 and it is green in colour. It was named after the Nahua word "Tlalpalli", which translates to paint, referring to the paint-like habit of the mineral. Its formula and crystal structure were redefined in 2019, showing it contained a mixed-valence phyllotellurate layer [Te4+3Te6+O12]12−.

Carlfriesite

Carlfriesite is a rare tellurium mineral with the formula CaTe4+2Te6+O8, or more simplified: CaTe3O8. It has a Moh's hardness of 3.5 and it occurs in various shades of yellow, ranging from bright yellow to a light buttery color. It was named after Carl Fries Jr. (1910–1965) from the U.S. Geological Survey and the Geological Institute of the National University, Mexico City, Mexico. It was previously thought to have the formula H4Ca(TeO3)3, but this was proven to be incorrect. It has no uses beyond being a collector's item.

Quetzalcoatlite

Quetzalcoatlite is a rare tellurium oxysalt mineral with the formula Zn6Cu3(TeO6)2(OH)6 · AgxPbyClx+2y. It also contains large amounts of silver- and lead(II)chloride with the formula AgxPbyClx+2y (x+y≤2). It has a Mohs hardness of 3 and it crystallizes in the trigonal system. It has a deep blue color. It was named after Quetzalcoatl, the Aztec and Toltec god of the sea, alluding to its color. It is not to be confused with tlalocite, which has a similar color and habit.

Teineite is a tellurite mineral with the formula Cu(TeO3). 2 H2O. It has a Moh's hardness of 2.5 and it comes in many different shades of blue, ranging from cerulean blue to bluish-gray. The mineral millsite has the same chemical composition, but crystallizes in the monoclinic system, while teineite crystallizes in the orthorhombic system.

Khinite

Khinite is a rare tellurate mineral with the formula Pb2+Cu2+3TeO6(OH)2 It crystallizes in the orthorhombic system and has a bottle-green colour. It is often found as dipyramidal, curved or corroded crystals no more than 0.15 mm in size. The tetragonal dimorph of khinite is called parakhinite.

Alvanite

Alvanite (IMA symbol: Alv) is a zinc nickel aluminum vanadate mineral with the chemical formula (Zn,Ni)Al4(V5+O3)2(OH)12·2H2O. It was originally discovered in the Karatau Mountains.

References

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID   235729616.
  2. "Tlalocite: Tlalocite mineral information and data". www.mindat.org. Retrieved 2016-09-19.
  3. Barthelmy, Dave. "Tlalocite Mineral Data". www.webmineral.com. Retrieved 2016-09-19.
  4. "Handbook of Mineralogy" (PDF). Retrieved 2016-09-19.
  5. Williams, S.A. (1975). "Xocomecatlite, Cu3TeO4(OH)4, and tlalocite, Cu10Zn6(TeO3)(TeO4)2CI(OH)25 . 27 H2O, two new minerals from Moctezuma, Sonora, Mexico" (PDF). Mineralogical Magazine. 40 (311). doi:10.1180/minmag.1975.040.311.01 . Retrieved 2016-09-19.