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Cummingtonite

Cummingtonite

Grunerite is an end member of the cummingtonite-grunerite series. Structure and composition are anal-ogous to cummingtonite. The name grunerite is by definition restricted to compositions close to end member Fe7Si8O22(OH)2.

Grunerite

Spodumene

Spodumene

Cummingtonite

Antigorite

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Kaolinite

Hand Specimen identification: Claylike properties, including softness, habit, feel, and earthy smell, help identify kaolinite, but withoutX-ray data it cannot be distinguished from other light-colored clays. Chemical Composition : Al2Si2O5(OH)4 Hardness : 2 to 21 2 Specific Gravity2.6 Cleavage/Fracture : perfect (001) but rarely seen Luster/Transparency : dull/sometimes translucent Color …

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Montmorillonite

Hand Specimen identification: Clays are difficult to tell apart without detailed X-ray study. When massive, they are unctuous and earthy if wet, and appear as soft, very fine-grained aggre-gates if dry. Chemical Composition : (Ca,Na) 0.2 – 0.4(Al,Mg,Fe)2(Si,Al) 4O10(OH)2 Hardness : 1 to 11 2 Specific Gravity2.0 to 2.7 Cleavage/Fracture …

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Chrysotile

Hand Specimen identification: Fiberlike, asbestiform appearance is diagnostic (Figure 8). Chrysotile may be distinguished from most fibrous amphiboles by its greenish white color; com-pare Plates 3.4 and 3.7. Chemical Composition : Mg6Si4O10(OH)8 Hardness : 3 to 5 Specific Gravity2.5 to 2.6 Cleavage/Fracture : none/uneven Luster/Transparency : greasy, waxy/translucent Color : …

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