Physical Properties Flashcards
Minerals with a hardness above 7 (3)
Spinel, Corundum, Diamond
List the clinopyroxenes from lightest to darkest colour
Diopside, Augite, Aegerine
Cleavage of pyroxenes
2 cleavages @ 90 degrees
Cleavage of amphiboles
2 cleavages @ 124 + 56 degrees
Magnetic minerals (2)
Magnetite and Pyrrhotite
Weakly magnetic minerals (2)
Ilmenite and Chromite
Minerals with a high SG (5)
Galena, Aragonite, Barite, Cinnabar, Cassiterite
Minerals with a trapezohedra form (3)
Garnet, Leucite, Analcime
Difference between microcline and plagioclase feldspars
Microcline has worms, while plagioclase has striations
Minerals with a grey streak (2)
Graphite and Stibnite
Minerals with a black streak (4)
Pyrite, Magnetite, Pyrolusite, Ilmenite
Minerals with a red-brown streak (2)
Hematite and Cuprite
Minerals with a yellow-brown streak (2)
Goethite and Limonite
What streak does galena have?
Grey-black
What streak does chalcopyrite have?
Greenish black
What streak does cinnabar have?
Scarlet red
Minerals with a brown streak (2)
Chromite and Pentlandite
Which mineral has peacock ore?
Bornite
Which mineral has a rotten egg smell when HCl is applied?
Siderite
What are the two main forms of Pyrite?
Pyritohedron and Cube
What mineral has rounded grains and is earthy?
Bauxite
What mineral has cockscomb?
Marcasite
What mineral has a smell of garlic?
Arsenopyrite
What mineral is extremely sparkly?
Sphalerite
