metamorphic

Mica Schist / Granite

Mica Schist (Silicate metamorphic rock)

AI-generated identification · may be incorrect

Hardness: 3-6 on Mohs scale depending on specific mineral components. Color: Pinkish-brown, tan, or grey with highly reflective metallic sparkles. Luster: Pearly to vitreous and highly sparkling. Texture: Medium to coarse-grained metamorphic schistosity.…

Hardness: 3-6 on Mohs scale depending on specific mineral components
Luster: Pearly to vitreous and highly sparkling

Identified July 27, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed under regional metamorphism where intense heat and directional pressure transform pre-existing shale, mudstone, or granitic igneous rock. Mica crystals align perpendicular to the direction of pressure, creating a shiny, sparkling foliation.

Uses & applications

Occasionally used as decorative stone, facing stone in architecture, garden landscaping, or as educational geology specimens.

Geological facts

The sparkling effect comes from tiny flakes of muscovite or phlogopite mica reflecting light, which can make the rock look like it is covered in glitter or diamonds.

Field identification & locations

Look for flaky, glittery mineral layers that catch light easily. Commonly found in mountainous regions undergoing metamorphic processes like the Appalachian Mountains, Alps, and Scottish Highlands.