metamorphic
Blue-green amphibole-bearing rock (possibly actinolite schist)
Likely actinolite-rich rock; actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
AI-generated identification · may be incorrectRough, blue-green to gray with rusty iron-oxide staining and a somewhat fibrous or granular texture. Actinolite has Mohs hardness 5–6, vitreous to dull luster, and monoclinic crystals; the rock’s exact properties depend on its other minerals.
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Physical properties
Rough, blue-green to gray with rusty iron-oxide staining and a somewhat fibrous or granular texture. Actinolite has Mohs hardness 5–6, vitreous to dull luster, and monoclinic crystals; the rock’s exact properties depend on its other minerals.
Formation & geological history
If actinolite schist, it formed when magnesium- and iron-rich rocks were metamorphosed under greenschist-facies conditions. Such metamorphism commonly occurred during ancient mountain-building; the specimen’s age and locality cannot be determined from the image.
Uses & applications
Actinolite-bearing rock is chiefly of mineralogical interest; some varieties are collected or used as decorative stone. Fibrous actinolite should not be cut or ground because certain forms may contain hazardous asbestos fibers.
Geological facts
The visible color and texture are consistent with, but do not confirm, actinolite-bearing material; other green metamorphic rocks can look similar.
Field identification & locations
A mineral test or close inspection for elongated amphibole crystals would help identify it; common occurrences include metamorphic belts and altered mafic rocks worldwide. Image-based identification is uncertain.
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