tyrolite
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Tyrolite is a hydrous calcium copper arsenate carbonate mineral with the formula CaCu5(AsO4)2CO3(OH)4⋅6H2O. Tyrolite forms glassy, blue to green orthorhombic radial crystals and botryoidal masses. It has a Mohs hardness of 1.5–2.0 and a specific gravity of 3.1–3.2. It is translucent with refractive indices of nα = 1.694, nβ = 1.726, and nγ = 1.730.
Key facts
- Mineral.name
- Tyrolite
- Mineral.image
- Tyrolite-256893.jpg
- Mineral.imagesize
- 260px
- Mineral.category
- Arsenate and carbonate minerals
- Mineral.IMAsymbol
- Tyl
- Mineral.strunz
- 8.DM.10
- Mineral.system
- Orthorhombic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- P2/c (no. 13) or C2/c (no. 15)
- Mineral.color
- Blue to green
- Mineral.habit
- Radial or botryoidal
- Mineral.mohs
- 1.5–2.0
- Mineral.luster
- Vitreous
- Mineral.diaphaneity
- Translucent
- Mineral.gravity
- 3.1–3.2
- Mineral.refractive
- nα = 1.694nβ = 1.726nγ = 1.730
via Wikipedia infobox
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Encyclopedic overview
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- References
Tyrolite is a hydrous calcium copper arsenate carbonate mineral with the formula CaCu5(AsO4)2CO3(OH)4⋅6H2O. Tyrolite forms glassy, blue to green orthorhombic radial crystals and botryoidal masses. It has a Mohs hardness of 1.5–2.0 and a specific gravity of 3.1–3.2. It is translucent with refractive indices of nα = 1.694, nβ = 1.726, and nγ = 1.730.
It is a secondary mineral formed by the weathering of associated copper and arsenic minerals. It was first described in 1845 for an occurrence in Schwaz, Tyrol, Austria.
Excerpted from Wikipedia’s “tyrolite” article, available under the CC BY-SA 4.0 licence.