Minerals - Malchite

MALACHITE

Category: Mineral
Chemical formula: Cu2CO3(OH)2
Color: Green
Crystal habit: Massive, botryoidal, stalactitic
Crystal system: Monoclinic - prismatic
Cleavage: Perfect
Fracture: Conchoidal to splintery
Mohs Scale hardness: 3.5 - 4
Luster: Dull/vitreous in large quantities, silky in crystal form
Streak: Green
Specific gravity: 3.6 - 4

Minerals - Hematite

HEMATITE

Category: Mineral
Chemical formula: Iron(III) oxide, Fe2O3, α-Fe2O3
Color: Metallic grey to earthy red
Crystal habit: Tabular to thick crystals
Crystal system: Hexagonal (rhombohedral)
Cleavage: None
Fracture: Uneven to sub-conchoidal
Mohs Scale hardness: 5.5 - 6.5
Luster: Metallic to splendent
Refractive index: Opaque
Pleochroism: None
Streak: Bright red to dark red
Specific gravity: 4.9 - 5.3

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