metamorphic
Greenstone (likely actinolite-bearing metamorphic rock)
Actinolite-rich greenschist; exact identification requires testing
AI-generated identification · may be incorrectSmall rough green specimen with a mottled, fine-grained appearance. Actinolite has Mohs hardness 5–6, vitreous to silky luster, and monoclinic crystals; the image does not reveal reliable cleavage or density.
Identified More metamorphic →
Explore Greenstone (likely actinolite-bearing metamorphic rock) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Small rough green specimen with a mottled, fine-grained appearance. Actinolite has Mohs hardness 5–6, vitreous to silky luster, and monoclinic crystals; the image does not reveal reliable cleavage or density.
Formation & geological history
Typically forms when basaltic rocks undergo low-grade metamorphism, commonly during ancient seafloor alteration or mountain building. Such rocks occur across many geological ages.
Uses & applications
Greenstone is used as decorative or carving stone and collected as a specimen; actinolite may occur in ornamental stones, though fibrous varieties require careful handling.
Geological facts
“Greenstone” is a broad field term for green, altered or metamorphosed rock, not a single mineral species.
Field identification & locations
Its green color and mottled texture are consistent with greenstone, but the photo cannot confirm its minerals; inspect for fine foliation and have it tested. Greenstones occur in metamorphic belts worldwide.
More like this
