Decrespignyite-(Y)

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Decrespignyite-(Y)
Decrespignyite-(Y) and minor Kamphaugite-(Y).jpg
Near perfect formation of (blue) Decrespignyite-(Y) crystals creating botryoidal type formations with a small amount of (grey) Kamphaugite-(Y)
General
Category Carbonate minerals
Formula
(repeating unit)
Cu(Y, REE)4(CO3)4(OH)5Cl · 2H2O
IMA symbol Dcp-Y [1]
Strunz classification 5.CC.35
Dana classification16a.1.11.1
Crystal system Monoclinic
Unknown space group
Identification
Colorbright royal blue to pale blue
Fracture none observed
Mohs scale hardness4
Luster vitreous, pearly
Streak pale blue
Density 3.64 g/cm3 (measured) 3.645 g/cm3 (calculated) [2]
References [3] [4]

Decrespignyite-(Y) is a copper yttrium rare earth carbonate chloride hydrate; [2]

Contents

With a simple formula of; Cu(Y, REE)4(CO3)4(OH)5Cl · 2H2O [3]

Usually found as single pseudohexagonal platelets, often curved, and regularly measuring 10-50μm in size. It appears as royal blue to turquoise blue in colour, with a pale blue streak, and a pearly to vitreous lustre. Regarded as a supergene mineral which is believed to be formed through by mildly carbonated ground waters precipitating through the ore body. It is often associated with malachite, kamphaugite-(Y), donnayite-(Y) and caysichite-(Y) [2]

Discovery

First discovered at the Paratoo copper mine, near Yunta, Olary district, South Australia; Decrespignyite-(Y) was first brought to the attention of Dr. Allan Pring (Principal Research Scientist and Head, Mineral Sciences, South Australian Museum 1984 [5] -2015[ citation needed ]) in 1998, by Mr. John Toma, a prominent South Australian mineral collector and amateur mineralogist. Mr. Toma had noted unusual properties of an unknown mineral specimen, requesting Dr. Pring and the SA museum Mineral Sciences team test the unknown sample.

Research and Publication

Dr. Pring joined with Dr. U. Kolitsch (Curator of minerals and deposit collection, Mineralogical-petrographic Abt. Natural History Museum, Austria), K. Wallwork (School of Chemistry, Physics and Earth Sciences, The Flinders University of South Australia), and L. Nasdala (Institute of Geosciences and Mineralogy, Johannes Gutenberg University, Germany), [2] to perform the required tests and analyses in order to determine the nature, and properties of this (then) new mineral. Using a combination of X-ray diffraction , with analysis using a 100 mm diameter Guinier-Ha gg camera (using Cr-Kα1 radiation (l=2.28970 A°) and Si as an internal standard), vibrational spectroscopy gaining Raman spectra obtained by use of a Renishaw RM 1000 system, (equipped with Leica DMLM series optical microscope), and chemical analysis via electron microprobe using a Cameca CAMEBAX SX51 electron microscope, and observations of physical properties; the team eventually determined no other known mineral matched the specimens collected. [2]

Naming

Results of the analyses were presented to IMA Commission on New Minerals and Mineral Names (2001-027) during 2001. The presentation requested the naming of the new mineral to be made in honour of Australian Mr. Robert J. Champion de Crespigny (b.1950), for recognition of his contributions to the Australian education and the Australian mining industry. At the time he held positions of executive chairman of Normandy Mining Limited, Chancellor of the University of Adelaide, and was the Chairman of the South Australian Museum. The IMA approved the naming, and the status of the mineral Decrespignyite-(Y) (2001-027) [6] during 2001, with the description paper by Wallwork et al. being published later in 2002. [2]

Related Research Articles

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Euxenite, or euxenite-(Y), is a brownish black mineral with a metallic luster.

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

Tenorite is a copper oxide mineral with the chemical formula CuO.

<span class="mw-page-title-main">Mckelveyite-(Y)</span>

Mckelveyite-(Y) is a hydrated sodium, barium, yttrium, and uranium–containing carbonate mineral, with the chemical formula Ba3Na(Ca,U)Y(CO3)6·3H2O.

Robert James Champion de Crespigny, AC is a multi-millionaire Australian businessman and founder of Normandy Mining Limited. Currently estimated with his ownership in PBE and Rutherford corporations his net worth is near 1B. In 2004 his personal wealth was approximately $170 million. He has held numerous influential positions in corporate and public life, including serving as chancellor of the University of Adelaide (2000-2004) and chair of the South Australian Economic Development Board (2002-2006). As of 2014, he continues to advise the Government of South Australia through his role on the South Australian Minerals & Petroleum Expert Group (SAMPEG) for the Department of State Development. He currently resides in the United Kingdom.

<span class="mw-page-title-main">Uranyl carbonate</span> Chemical compound

Uranyl carbonate refers to the inorganic compound with the formula UO2CO3. Also known by its mineral name rutherfordine, this material consists of uranyl (UO22+) and carbonate (CO32-). Like most uranyl salts, the compound is a polymeric, each uranium(VI) center being bonded to eight O atoms. Hydrolysis products of rutherfordine are also found in both the mineral and organic fractions of coal and its fly ash and is the main component of uranium in mine tailing seepage water.

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

Pseudomalachite is a phosphate of copper with hydroxyl, named from the Greek for “false” and “malachite”, because of its similarity in appearance to the carbonate mineral malachite, Cu2(CO3)(OH)2. Both are green coloured secondary minerals found in oxidised zones of copper deposits, often associated with each other. Pseudomalachite is polymorphous with reichenbachite and ludjibaite. It was discovered in 1813. Prior to 1950 it was thought that dihydrite, lunnite, ehlite, tagilite and prasin were separate mineral species, but Berry analysed specimens labelled with these names from several museums, and found that they were in fact pseudomalachite. The old names are no longer recognised by the IMA.

<span class="mw-page-title-main">Allanpringite</span> Phosphate mineral

Allanpringite is a phosphate mineral named after Australian mineralogist Allan Pring of the South Australian Museum. Allanpringite is a Fe3+ analogue Al-phosphate mineral wavellite, but it has a different crystal symmetry – monoclinic instead of orthorhombic in wavellite. It forms needle-like crystals, which are always twinned and form parallel bundles up to about 2 mm long. They are often found in association with other iron phosphates in abandoned iron mines.

<span class="mw-page-title-main">Donnayite-(Y)</span> Rare-earth carbonate mineral containing the rare-earth metal yttrium

Donnayite-(Y) is a rare-earth carbonate mineral containing the rare-earth metal yttrium. It was first discovered in 1978 at Mont Saint-Hilaire, Quebec. Donnayite was subsequently identified and named after Joseph D. H. Donnay and his wife, Gabrielle Donnay. Both were prominent mineralogists and crystallographers, and J. D. H. Donnay was awarded the Roebling Award by the Mineralogical Society of America in 1971 for his emphasis on the importance of optical mineralogy and crystal morphology. Donnayite tends to occur in small quantities in the pegmatite dykes and miarolitic cavities of mountainous regions. It crystallizes in this environment with increasing alkalinity values until the alkalinity suddenly drops during the last stage of crystallization. This results in increasing amounts of Na carbonates and REE minerals. First discovered at Mont St-Hilaire, donnayite has since been found in the Southern Ural Mountains of Russia and the Narssarssuk pegmatite of South Greenland. Donnayite crystals tend to be small and the color is commonly pale yellow to yellow with a white streak and a vitreous luster. Donnayite crystals usually display trigonal or hexagonal symmetry and have a hardness of 3. Twinning is extremely common in this mineral. Minerals closely related to donnayite include synchysite, calcite, sphalerite, microcline, and analcime. Donnayite is isomorphous with weloganite and mckelveyite.

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

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

Znucalite or CaZn11(UO2)(CO3)3(OH)20·4(H2O) is a rare, radioactive, white to pale cream colored uranium-containing carbonate mineral, hydrated calcium zinc uranyl carbonate hydroxide. Znucalite crystallizes in the orthorhombic system, often forming aggregates or crusts, and is found as a rare secondary species in carbonate-hosted (meaning it is mined from carbonate containing formations such as limestone) polymetallic veins, and nearby oxidizing uranium veins; on dump material and coating mine walls, apparently of post-mine origin. It fluoresces yellow-green under UV light.

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

Posnjakite is a hydrated copper sulfate mineral. It was discovered in the Tungsten deposit of Nura-Taldy in Karaganda Region in Kazakhstan and described in 1967 by Aleksandr Ivanovich Komkov (1926–1987) and Yevgenii Ivanovich Nefedov (1910–1976) and named after geochemist Eugene Valdemar Posnjak (1888–1949).

Waterhouseite, Mn7(PO4)2(OH)8, is a hydroxy manganese phosphate mineral. It is a medium-soft, brittle mineral occurring in pseudo-orthorhombic monoclinic bladed crystals and orange-brown to dark brown in color. Waterhouseite is on the softer side with a Mohs hardness of 4, has a specific gravity of 3.5 and a yellowish-brown streak. It is named after Frederick George Waterhouse, first director of the South Australian Museum, as well as recognizes the work Waterhouse Club has done in support of the South Australian Museum.

Reederite-(Y) is a rare mineral with the formula (Na,Mn,Fe)15(Y,REE)2(CO3)9(SO3F)Cl. It is the only known mineral with fluorosulfate (fluorosulfonate). "REE" in the formula stands for rare earth elements other than yttrium, that is mostly cerium, with traces of neodymium, dysprosium, lanthanum and erbium. The formula also includes a Levinson suffix "-(Y)" pointing to the dominance of yttrium at the corresponding site. Reederite-(Y) crystallizes in the hexagonal crystal system with the space group P6, rarely seen among minerals.

Bijvoetite-(Y) is a very rare rare-earth and uranium mineral with the formula (Y,REE)8(UO2)16(CO3)16O8(OH)8·39H2O. When compared to the original description, the formula of bijvoetite-(Y) was changed in the course of crystal structure redefinition. Bijvoetite-(Y) is an example of natural salts containing both uranium and yttrium, the other examples being kamotoite-(Y) and sejkoraite-(Y). Bijvoetite-(Y) comes from Shinkolobwe deposit in Republic of Congo, which is famous for rare uranium minerals. The other interesting rare-earth-bearing uranium mineral, associated with bijvoetite-(Y), is lepersonnite-(Gd).

The carbonate chlorides are double salts containing both carbonate and chloride anions. Quite a few minerals are known. Several artificial compounds have been made. Some complexes have both carbonate and chloride ligands. They are part of the family of halocarbonates. In turn these halocarbonates are a part of mixed anion materials.

<span class="mw-page-title-main">Paratooite-(La)</span>

Paratooite-(La) is a complex lanthanum copper(II) calcium sodium carbonate mineral, representing a unique elemental combination among the known minerals. It is a secondary, weathering mineral. There is a heterovalent diadochy substitution of lanthanum by strontium and calcium; also sodium is substituted by calcium in the mineral. Its structure proved to be more difficult to describe within the initial approach. It was later shown to be a superstructure of another rare earth carbonate mineral, carbocernaite. The "-(La)" suffix in the mineral's name is known as Levinson suffix. It refers to the particular element, of a group of elements, that dominates in the particular structural site. As such, the element would show major, dominant occupancy at this particular site.

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. 1 2 3 4 5 6 K. Wallwork; U. Kolitsch; A. Pring; L. Nasdala (2002). "Decrespignyite-(Y), a new copper yttrium rare earth carbonate chloride hydrate from Paratoo, South Australia" (PDF). RRUFF. RRUFF. Retrieved October 9, 2015.
  3. 1 2 "Decrespignyite-(Y)". Mindat.org. Mindat. Retrieved October 9, 2015.
  4. Webmineral data
  5. "Allan Pring". South Australian Museum. South Australian Museum. Archived from the original on September 8, 2015. Retrieved October 9, 2015.
  6. "New Minerals Approved In 2001" (PDF). IMA. IMA. Retrieved October 10, 2015.