Junitoite
Sorosilicate mineral / From Wikipedia, the free encyclopedia
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Junitoite is a mineral with formula CaZn2Si2O7·H2O. It was discovered at the Christmas mine in Christmas, Arizona, and described in 1976. The mineral is named for mineral chemist Jun Ito (1926–1978).
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Junitoite | |
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General | |
Category | Sorosilicate |
Formula (repeating unit) | CaZn2Si2O7·H2O |
IMA symbol | Jit[1] |
Strunz classification | 9.BD.15 |
Dana classification | 56.2.1.1 |
Crystal system | Orthorhombic |
Crystal class | Pyramidal (mm2) H-M group: (mm2) |
Space group | Ama2[2] |
Unit cell | a = 12.510(7) b = 6.318(3) c = 8.561(6) [Å]; Z = 4[2] |
Identification | |
Color | Colorless, milk-white, or colored due to alteration[2] |
Cleavage | Good on {100}; poor on {010} and {011} |
Fracture | Micaceous |
Tenacity | Brittle to semi-sectile due to alteration[2] |
Mohs scale hardness | 4.5 |
Luster | Adamantine, Vitreous, Sub-Vitreous |
Streak | Colorless |
Diaphaneity | Transparent to translucent[2] |
Optical properties | Biaxial (+) |
Refractive index | nα = 1.656 nβ = 1.664 nγ = 1.672 |
Birefringence | δ = 0.016 |
2V angle | Measured: 86°, Calculated: 88° |
References | [3] |
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