posnjakite
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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).
Key facts
- Mineral.name
- Posnjakite
- Mineral.category
- Copper minerals
- Mineral.image
- Posnjakite-113800.jpg
- Mineral.caption
- Posnjakite from Špania Dolina in Slovakia
- Mineral.formula
- Cu4[(OH)6SO4] • H2O
- Mineral.IMAsymbol
- Pnk
- Mineral.molweight
- 488.32 g/mol
- Mineral.strunz
- 7.DD.10
- Mineral.dana
- 31.4.1.1
- Mineral.system
- Monoclinic
- Mineral.class
- Domatic (m) (same H-M symbol)
- Mineral.symmetry
- Pa
- Mineral.unit cell
- a = 10.578 Å, b = 6.345 Å, c = 7.863 Å; β = 117.98°; Z = 2
- Mineral.color
- Sky-blue to dark-blue
- Mineral.habit
- Crystals scaly, or as crusts; earthy
- Mineral.mohs
- 2 to 3
- Mineral.luster
- Vitreous
- Mineral.refractive
- nα = 1.625 nβ = 1.680 nγ = 1.706
via Wikipedia infobox
Wikidata facts
- Image
- Posnjakite-113800.jpg
Show 7 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 7.DD.10
- Commons category
- Posnjakite
- Nickel-Strunz 9th edition (updated 2009)
- 7.DD.10
- crystal system
- monoclinic crystal system
- IMA Mineral Symbol
- Pnk
- chemical formula
- Cu₄SO₄(OH)₆·H₂O
- Strunz 8th edition (series ID, updated)
- VI/D.01
Sources (1)
via Wikidata · CC0
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Encyclopedic overview
2 sectionsContents
- Occurrence
- References
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).
== Occurrence == Posnjakite is an uncommon but widespread secondary mineral in the oxidised zone of copper sulfide deposits, which may be of post-mine formation. It is associated with brochantite, langite, devilline, serpierite, woodwardite, wroewolfeite, aurichalcite, azurite, malachite and chalcopyrite.
Excerpted from Wikipedia’s “posnjakite” article, available under the CC BY-SA 4.0 licence.
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