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microcrystal

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allochemical

Overview page. Subjects: Earth Sciences and Geography.

A limestone defined by the Folk classification as comprising allochems with either a sparry calcite cement (sparite), or a microcrystalline calcite (micrite) matrix. Limestones lacking...

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devitrification

Overview page. Subjects: Earth Sciences and Geography — Medicine and Health.

The crystallization of minerals following the melting of a glass; this most commonly occurs in glassy ignimbrites, where the glass is replaced by microcrystalline cristobalite and alkali...

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lepisphere

Overview page. Subjects: Earth Sciences and Geography.

A microcrystalline, blade-shaped crystal of a metastable variety of quartz, composed of cristobalite with interlayered lattices of tridymite, aggregates of which often occur during the...

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montmorillonite

Overview page. Subjects: Earth Sciences and Geography.

A clay mineral of variable composition. It is a hydrated aluminosilicate with a large capacity for exchanging cations (see ion exchange) and is the principal constituent of bentonite and...

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X-ray powder photograph

Overview page. Subjects: Earth Sciences and Geography.

A photograph produced by monochromatic X-irradiation of a sample of microcrystalline powder placed at the centre of a circular camera, e.g. a Debye-Scherrer camera. Diffracted X-rays are...

See overview in Oxford Index