Fluorite on Celestine

Fluorite – CaF₂

Elements: Calcium, Fluorine

Class: Halides

Crystal System: Cubic

Hardness: 4

Fluorite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Celestine – Sr(SO₄)

Elements: Strontium, Sulfur, Oxygen

Class: Sulfates

Crystal System: Orthorhombic

Hardness: 3-3.5

Calcite

Talc (1)Diamond (10)

A copper coin can scratch it.

Origin: Tule Mine, Melchor Muzquiz, Coahuila – Mexico

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