Aerinite
Appearance
Aerinite | |
---|---|
General | |
Category | Inosilicate |
Formula (repeating unit) | Ca4(Al,Fe,Mg)10Si12O35(OH)12CO3·12H2O |
Strunz classification | 9.DB.45 |
Crystal system | Monoclinic Unknown space group |
Unit cell | a = 14.690(15), b = 16.872(15) c = 5.170(15) [Å]; β = 94.75°; Z = 1[1] |
Identification | |
Color | Blue to blue-green |
Crystal habit | fibrous |
Mohs scale hardness | 3 |
Luster | vitreous |
Streak | bluish white |
Diaphaneity | translucent |
Specific gravity | 2.48 |
Optical properties | Biaxial (-) |
Refractive index | nα1.510(5), nβ = 1.560(5), nγ = 1.580 |
Pleochroism | Intense; X = bright blue; Y = Z = pale beige |
2V angle | 63° (calc.) |
Dispersion | δ = 0.07 |
References | [2][3][1] |
Aerinite (Ca4(Al,Fe,Mg)10Si12O35(OH)12CO3·12H2O) is a bluish-purple inosilicate mineral. It crystallizes in the monoclinic system and occurs as fibrous masses and coatings. It has a dark, vitreous luster, a specific gravity of 2.48 and a Mohs hardness of 3.
It is a low-temperature hydrothermal phase occurring in zeolite facies alteration of mafic rocks. Associated minerals include prehnite, scolecite and mesolite.[2]
Its name comes from a Greek root "aerinos," meaning "atmosphere" or "sky".[1]