Fluorite, Galena & Gypsum

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.

Galena – PbS

Elements: Lead, Sulfur

Class: Sulfides

Crystal System: Cubic

Hardness: 2.5-2.75

Calcite

Talc (1)Diamond (10)

Soft. A fingernail can scratch it.

Gypsum – Ca(SO₄)·2H₂O

Elements: Calcium, Sulfur, Oxygen, Hydrogen

Class: Sulfates

Crystal System: Monoclinic

Hardness: 2

Gypsum

Talc (1)Diamond (10)

Soft. A fingernail can scratch it.

Origin: Naica, Chihuahua – Mexico

More Cubic specimens