M MineralystRock & Mineral Guide
Mineral

Thomsonite

Thomsonite — reference photo

Thomsonite is a mineral with the chemical formula NaCa_2Si_3Al_3O_10·6H_2O. It has a Mohs hardness of 5-6 and vitreous to dull luster.

Thomsonite properties

TypeMineral
Chemical formulaNaCa_2Si_3Al_3O_10·6H_2O
Mohs hardness5-6
LusterVitreous to dull
Typical colorsWhite, pink, red, yellow, green
FormationThomsonite typically forms in basaltic lavas and is often found in vesicles.
Rarity5 / 10

Mohs hardness 5–6 — fairly hard

1 · Talc5 · Apatite10 · Diamond
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