Rodalquilarite | |
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General | |
Category | Tellurite mineral |
Formula (repeating unit) | H3Fe3+2(Te4+O3)4Cl |
IMA symbol | Raq[1] |
Strunz classification | 4.JL.05 |
Crystal system | Triclinic |
Crystal class | Pinacoidal (1) (same H-M symbol) |
Space group | P1 |
Unit cell | a = 8.95 Å, b = 5.09 Å c = 6.63 Å; α = 103.17° β = 107.08°, γ = 77.87°; Z = 1 |
Identification | |
Color | Emerald- to grass-green |
Crystal habit | Crusts of stout crystals |
Cleavage | One good cleavage plane |
Tenacity | Very brittle |
Mohs scale hardness | 2 - 3 |
Luster | Greasy |
Streak | Greenish yellow |
Diaphaneity | Semitransparent |
Specific gravity | 4.97 - 5.15 |
Optical properties | Biaxial (-) |
Refractive index | nα = 2.100 nγ = 2.200 |
Birefringence | δ = 0.100 |
2V angle | 38° |
References | [2][3][4] |
Rodalquilarite is a rare iron tellurite chloride mineral with formula H3Fe3+2(Te4+O3)4Cl[2] or Fe2(TeO2OH)3(TeO3)Cl.[3] Rodalquilarite crystallizes in the triclinic system and typically occurs as stout green prisms and encrustations.