corundum var. ruby, garnet var. almandin, mica var. biotite, feldspar var. plagioclase : Khit Ostrov (Khit, Island), Northern Karelia, Karelia Republic, Norther — Photo: Géry PARENT · Public domain
Plagioclase
Also known as: Soda-lime feldspar.
The continuous feldspar series from albite to anorthite — the most abundant minerals in Earth's crust.
Intro adapted from Wikipedia (CC BY-SA).
Plagioclase is a mineral group, with the chemical formula (Na,Ca)(Al,Si)₄O₈.
It crystallizes in the triclinic crystal system.
Key properties: Mohs hardness 6–6.5; typically white or gray or colorless.
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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