Minerals Flashcards
Yellow Brown in colour
White to pale yellow streak
Resinous lustre
Spahlerite
Colourless to white, yellow, blue or red
3 Cleavage planes at 90°
Less hard than glass
Sylvite
Non metallic
Harder than Glass
2 Cleavage Planes
White, Blue-Grey, Black
Plagioclase Feldspar
Red-Brown in colour
Red-Brown streak
Dull, non metallic lustre
Hematite
Conchoidal Fracture
Vitreous Lustre
Harder than glass
Poor cleavage
Quartz
White to grey to pale green
Less hard than glass
1 Plane of cleavage
Talc
Colourless to light brown
Breaks into thin sheets
Non metallic
Less hard than glass
Muscovite
Metallic Lustre
Yellow to dark brown colour
Yellow-brown to dark-brown streak
Poor cleavage
Sphalerite
Colourless to white in colour
Less hard than glass
3 Planes of cleavage
Non-Metallic lustre
Gypsum
Black in colour
Harder than glass
Poor cleavage
Metallic lustre
Magnetite
Red-brown to brown Conchoidal fracture Non metallic lustre Harder than glass Poor cleavage
Garnet
Non-Metallic Less hard than glass Poor Cleavage Yellow-brown streak Earthy lustre
Limonite
Tan-Pink, White, Green, black
Non metallic lustre
2 planes of cleavage at 90°
Potassium Feldspar
Colourless to white in colour 3 Planes at 90° Less hard than glass Non metallic lustre Cubic habit
Halite
Colourless, White, yellow
Non metallic
3 Cleavage planes at 60 or 120
Calcite
Brass-Yellow in colour
Poor cleavage
Cubic habit
Green or brown black streak
Pyrite
Brass-Yellow Greenish black streak Non metallic Softer than glass Poor cleavage
Chalcopyrite
Brown to black in colour
Sheet cleavage
Softer than glass
Non metallic
Biotite
Metallic lustre Yellow-brown to dark brown Yellow brown streak Softer than glass Poor cleavage
Limonite
Metallic lustre
Clear cleavage 3 planes at 90°
Less hard than glass
Galena
Steel gray to black in colour
Metallic
Poor cleavage
Red-Brown streak
Hematite
Black to greenish black in colour
2 planes of cleavage at 60 and 120
Harder than glass
Non metallic
Amphibole
Pale yellow to olive green
Glassy grains
Non metallic lustre
Poor cleavage
Olivine
Non metallic
Poor cleavage
Conchoidal fracture
Dull lustre
Cryptocrystalline quartz
Black to greenish black in colour
2 planes at 90°
Pyroxene
