Sulfate mineral
(repeating unit)Cu4Cd(SO4)2(OH)6·4H2O | | IMA symbol | Ndm[1] |
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| Strunz classification | 7.DD.30 |
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| Crystal system | Monoclinic |
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| Crystal class | Prismatic (2/m)
(same H-M symbol) |
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| Space group | P21/m |
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| Unit cell | a = 5.543(1), b = 21.995(4)
c = 6.079(1) [Å]; β = 92.04(3)°; Z = 2 |
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| Identification |
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| Color | Bluish green |
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| Crystal habit | Platy euhedral crystals and as green crusts |
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| Cleavage | Perfect on {010} |
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| Tenacity | Brittle |
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| Luster | Vitreous |
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| Streak | White |
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| Diaphaneity | Transparent |
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| Specific gravity | 3.292 |
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| Optical properties | Biaxial (-) |
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| Refractive index | nα = 1.599 - 1.619 nβ = 1.642 nγ = 1.661 |
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| Birefringence | δ = 0.062 |
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| 2V angle | Measured: 84° |
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| References | [2][3] |
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Niedermayrite is a rare hydrated copper cadmium sulfate hydroxide mineral with formula: Cu4Cd(SO4)2(OH)6·4H2O. It crystallizes in the monoclinic system and occurs as encrustations and well formed vitreous blue-green prismatic crystals. It has a specific gravity of 3.36.
Niedermayrite was named for Gerhard Niedermayr (born 1941), an Austrian mineralogist. It was first described in 1998 from a mine in the Lavrion District, Attica, Greece. It is also reported from the Ophir District, Tooele County, Utah.[2] The environment is in brecciated marble. The cadmium dominant analogue of campigliaite.
References
- ^ 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.
- ^ a b Niedermayrite on Mindat.org
- ^ Niedermayrite data on Webmineral
