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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

Lepidolite

Recent Posts

Scientists reveal likely origin of Earth’s oldest crystals

  New research suggests that the very oldest pieces of rock on Earth—zircon crystals—are likely to have formed in the craters left by violent asteroid impacts that peppered our nascent planet, rather than via plate tectonics as was previously believed. Rocks that formed over the course of Earth’s history allow …

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RIP CURRENT

Mostly occurring near shores and beaches RIP currents are strong, localized, narrow current of water which moves directly away from the shore, cutting through the lines of breaking waves like a small river flowing back to the sea. It happens to be the strongest near the surface of the water. The real …

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Orbicular Structure

Orbicular Structure in Bundelkhand Craton The Bundelkhand Craton is composed of palaeo‐Proterozoic granitic batholiths with slivers and narrow belts and rafts of older supra‐crustal rocks which range in age from 2.5 to 3.2 Ga. It is composed of various granitic phases ranging in composition from tonalite‐ trondjhemite‐granodiorite (TTG) suite to …

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