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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

Muscovite

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Type of Streams

Type of Streams

On the basis of their characteristics and patterns, streams are classified into a number of groups each of which implies something of the origin and history of stream. They are described below. Consequent Streams: On any newly uplifted land surface the first streams will have their own characters determined by …

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Cummingtonite

Hand Specimen identification: Prismatic habit, two perfect cleavages intersecting at near 60° when viewed in basal section, habit, color (if light brown), and association identify cummingtonite. It may be confused with other amphiboles, especially anthophyllite and gedrite. Chemical Composition : (Mg,Fe) 7Si8O22(OH)2 Hardness : 51 2 to 6 Specific Gravity2.9 …

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Spodumene

Hand Specimen identification: Spodumene is typically found in pegmatites where it may form very large crystals. Prismatic cleavage, hardness, color, and association help identify it, but it may be difficult to tell from feldspar or scapolite. it often has the appearance of a log or of petrified wood. Chemical Composition …

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