Kinoite
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| Kinoite | |
|---|---|
_Fond.jpg) Dark-blue Kinoite from the Christmas Mine, Banner District, Gila County, Arizona USA. Size: 7.6x70x3.5 cm. |
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| General | |
| Category | Sorosilicate |
| Chemical formula | Ca2Cu2Si3O8(OH)4 |
| Strunz classification | 09.BH.10 |
| Crystal symmetry | 2/m - Prismatic |
| Unit cell |
a = 6.99Å, b = 12.88Å, c = 5.65Å β = 96.18° |
| Identification | |
| Color | Transparent deep blue |
| Crystal system | Monoclinic |
| Cleavage | excellent {010}, distinct {001} and {100} |
| Mohs scale hardness | 2½ |
| Luster | Vitreous |
| Diaphaneity | Transparent |
| Specific gravity | 3.13 - 3.19 |
| Optical properties | Biaxial (-) |
| Refractive index | nα = 1.638 nβ = 1.665 nγ = 1.676 |
| Birefringence | δ = 0.038 |
| Pleochroism | Strong |
| 2V angle | Measured: 68° , calculated: 64° |
| Dispersion | relatively weak |
Kinoite (Ca2Cu2Si3O8(OH)4[1][2] or Ca2Cu2Si3O10·2H2O[3]) 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 in Arizona and a few other copper mines. Kinoite is popular with mineral collectors.
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