mineral
Celadonite in Basalt (Green Earth)
Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
AI-generated identification · may be incorrectHardness: 2; Color: Blue-green to apple-green; Luster: Dull to pearly; Crystal structure: Monoclinic; Cleavage: Perfect mica-like cleavage; Specific gravity: 2.7-3.0
- Hardness
- 2
- Color
- Blue-green to apple-green
- Luster
- Dull to pearly
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Physical properties
Hardness: 2; Color: Blue-green to apple-green; Luster: Dull to pearly; Crystal structure: Monoclinic; Cleavage: Perfect mica-like cleavage; Specific gravity: 2.7-3.0
Formation & geological history
Formed as an alteration mineral in the vesicles (gas bubbles) or cracks of volcanic rocks like basalt through low-grade hydrothermal metamorphism.
Uses & applications
Historically used as a stable green pigment ('Terra Verte' or Green Earth) in paintings and icons; also collected by mineral enthusiasts as an inclusion or coating.
Geological facts
It belongs to the mica group and is chemically very similar to glauconite, but it is primarily found in volcanic environments rather than marine sedimentary environments.
Field identification & locations
Identify by its distinctive soft, earthy green appearance often found lining the cavities of dark volcanic rocks. It feels slightly greasy and is soft enough to scratch with a fingernail.
