Leucophoenicite | |
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General | |
Category | Nesosilicates[1] |
Formula (repeating unit) | Mn7(SiO4)3(OH)2 |
IMA symbol | Lpo[2] |
Strunz classification | 9.AF.60[1] |
Dana classification | 52.3.2c.2[1] |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | P21/a |
Unit cell | a = 10.84 Å b = 4.82 Å c = 11.32 Å β = 103.93°;[1] Z = 2 |
Identification | |
Cleavage | Imperfect on {001} |
Tenacity | Brittle |
Mohs scale hardness | 5.5 to 6 |
Luster | Vitreous |
Diaphaneity | Transparent to translucent |
Optical properties | Biaxial (−) |
Refractive index | nα = 1.751 nβ = 1.771 nγ = 1.782[1] |
Birefringence | δ = 0.031[1] |
Pleochroism | Faint; rose-red ∥ {001} Colorless ⊥ {001} |
2V angle | 74° (measured) |
Ultraviolet fluorescence | Non-fluorescent[3] |
References | [4] |
Leucophoenicite is a mineral with formula Mn7(SiO4)3(OH)2. Generally brown to red or pink in color, the mineral gets its name from the Greek words meaning "pale purple-red". Leucophoenicite was discovered in New Jersey, US and identified as a new mineral in 1899.