metamorphic

Phyllite with Quartz Vein

Metamorphic Phyllite

AI-generated identification · may be incorrect

Hardness: 1-2 (talc/chlorite matrix) to 7 (quartz vein); Color: Greyish-green with a distinct dark/black vein; Luster: Sub-metallic to silky sheen on cleavage planes; Crystal structure: Microcrystalline, foliated

Hardness: 1-2 (talc/chlorite matrix) to 7 (quartz vein)
Color: Greyish-green with a distinct dark/black vein
Luster: Sub-metallic to silky sheen on cleavage planes

Identified July 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed from regional metamorphism of pelitic sediments (shale or slate) subjected to higher temperatures and pressures, typically during mountain-building events (orogenies).

Uses & applications

Primarily of academic, educational, and geological collecting interest; not typically used in heavy industry due to its fine foliation and fragility.

Geological facts

Phyllite represents a transitional stage in regional metamorphism between slate and schist, characterized by a characteristic satin-like sheen caused by minute flakes of white mica.

Field identification & locations

Identify in the field by its distinct foliation, silky sheen, and common quartz or mineral veins running through the matrix; found worldwide in ancient orogenic belts.