Amphibole var Hornblende 01 10x Photomicrograph From personal collection 18010129AmphiboleVarHornblendeB — Photo: Randolph Black from Grass Lake, MI, United States · PDM-owner
Amphibole
A major group of inosilicate rock-forming minerals built from double chains of silica tetrahedra, typically forming prismatic or needle-like crystals.
Intro adapted from Wikipedia (CC BY-SA).
Amphibole is a mineral group, with the chemical formula A₀₋₁B₂C₅T₈O₂₂(OH)₂.
It crystallizes in the monoclinic crystal system.
Key properties: Mohs hardness 5–6.5; typically green or black or brown or blue.
Collections: Everyday Minerals.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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