Aerinite
A variety of Minerals
What is Aerinite?
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. Its name comes from a Greek root "aerinos," meaning "atmosphere" or "sky".
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Aerinite Localities Map
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Quick Facts
Physical Properties
- Color
- blue to blue-green
- Hardness (Mohs)
- 3
- Streak
- bluish white
Chemical Properties
- Chemical Formula
- (Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO<sub>3</sub>)<sub>1.2</sub>(H<sub>2</sub>O)<sub>12</sub>] According to Rius et al. (2009), the formula of the Fe3+-rich variety includes SO3 (sulphite) substitution for carbonate.
- Elements
- Al, C, Ca, Fe, H, Mg, Na, O, Si
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