Prehnite In Thin Section
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Aggregates are fanlike reniform globular stalactitic.
Prehnite in thin section. Prehnite is colorless in thin section. Colorless in thin section. Pumpellyite ca 2 al 2 al fe 3 fe 2 mg 1 0 si 2 o oh 7 sio 4 oh o 3 named in 1925 by charles palache and helen e.
It may be confused with lawsonite pumpellyite epidote datolite and a number of zeo lites but has higher birefringence than all of them. Prehnite is an inosilicate of calcium and aluminium with the formula. Prehnite is a secondary or hydrothermal mineral and commonly lines cavities in igneous rocks.
It also occurs as stalactite masses. Search for prehnite using. Prehnite ca2al2si3o10 oh 2 c 2001 mineral data publishing version 1 2 crystal data.
Include nodular concretionary radial encrusting and stalactitic formations among other similar types. Prehnite crystallizes in the orthorhombic crystal system and most often forms as stalactitic or botryoidal aggregates with only just the crests of small crystals showing any faces which are almost always curved or composite. Vassar in honor of us geologist raphael pumpelly.
Ca 2 al alsi 3 o 10 oh 2. Pumpellyite is chemically and structurally related to epidote group. Limited fe 3 substitutes for aluminium in the structure.
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