igneous
Dark, coarse-grained rock (possibly diorite or amphibolite)
Undetermined; likely a mafic to intermediate rock containing plagioclase and dark amphibole or pyroxene
AI-generated identification · may be incorrectThe small, irregular specimen appears dark gray-green with a coarse, speckled texture. Hardness, luster, crystal structure, cleavage, and specific gravity cannot be determined reliably from the image.
Identified More igneous →
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Physical properties
The small, irregular specimen appears dark gray-green with a coarse, speckled texture. Hardness, luster, crystal structure, cleavage, and specific gravity cannot be determined reliably from the image.
Formation & geological history
If igneous, it formed as magma cooled slowly underground; if metamorphic, it may be amphibolite altered from a mafic igneous rock. Age and formation location cannot be established from appearance alone.
Uses & applications
Comparable rocks are used as crushed aggregate or dimension stone; this specimen is mainly suitable for general collecting.
Geological facts
Its visible speckling suggests multiple mineral grains, but the image does not show enough detail for a confident rock identification.
Field identification & locations
A fresh broken surface and closer examination of grain size and mineral colors would help distinguish diorite from amphibolite or other dark rocks. No specific locality can be inferred.
