metamorphic
Phyllite with Quartz Vein
Metamorphic Phyllite
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
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Physical properties
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
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.
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