Physical properties of minerals Cheat Sheet by Gollum

Form	Tabular, botrydal
Colour	Red, brown
Luster	Metallic
Steak	Reddish brown
Hardness	5.5-6.5
Clevage	None
Fracture	Uneven to subcon­choidal
Sp. Gravity	5.2
Chemical compos­ition	Fe2O3

Form	Amorphous
Colour	Yellow brown
Luster	Dull, vitreous
Streak	Yellow to brown
Hardness	4-5.5
Clevage	None
Fracture	Uneven
Sp. Gravity	2.7-4.5
Chemical compos­ition	FeO(OH­).nH2O

Form	Tetrah­edral, dodeca­hedral
Colour	White, yellow, brown
Luster	Resinous
Streak	Pale brown to yellow
Hardness	3.5-4.0
Clevage	Perfect
Fracture	Conchoidal
Sp. Gravity	3.9-4.1
Chemical compos­ition	(Zn,fe)s

Form	Prismatic, Tabular
Colour	Black, Dark green
Lustre	Vitreous
Streak	Colourless
Hardness	5-6
Cleavage	Imperfect
Fracture	Uneven
Sp. Gravity	2.9-3.4

Form	Prismatic, granular
Colour	White, gray
Luster	Vitreous
Streak	White
Hardness	6-6.5
Cleavage	Perfect
Fracture	Uneven
Sp. Gravity	2.5-2.6
Chemical compos­ition	K(AlSi3O8)

Form	Prismatic, Crysta­lline
Colour	Colour­less, white, Purple, Pink
Luster	Vitreous, Adamantine
Steak	Colourless
Hardness	7
Cleavage	Indistinct
Fracture	Conchoidal
Sp. Gravity	2.6-2.7
Chemical Company	SiO2

Form	Foliated, Massive
Colour	Colour­less, White
Streak	White
Hardness	2.5
Cleavage	Perfect
Fracture	Uneven
Sp. Gravity	2.7-3

Form	Prismatic, massive
Colour	White, colour­less, yellow
Luster	Vitreous, pearly
Streak	White
Hardness	6-6.5
Cleavage	Good to perfect
Fracture	Conchoidal
Sp. Gravity	2.6-2.8

Form	Micaceous, Lamellar
Colour	Black,Dark brown, Black
Luster	Vitreous to pearly
Steak	White to gray
Hardness	2.5-3
Cleavage	Perfect
Fracture	Uneven
Sp. Gravity	2.8-3.4

Form	Tabular
Colour	White, Gray
Luster	Dull, Earthy
Streak	Usually white but iron stain can discolour
Hardness	1-3
Cleavage	None
Fracture	Irregular
Sp. Gravity	2-2.5
Chemical compos­ition	Al(OH)3

Form	Euhedral
Colour	Brass yellow
Luster	Metallic
Steak	Greenish black
Hardness	3.5-4
Clevage	Poor/i­ndi­stinct
Fracture	Uneven
Sp. Gravity	4.1-4.3
Chemical compos­ition	CuFeS2

Form	Dendritic
Colour	Iron black
Luster	Metallic, dull
Steak	Bluish black
Hardness	6-6.5
Clevage	Perfect
Fracture	Uneven­/Br­ittle
Sp. Gravity	4.4-5.1
Chemical compos­ition	MnO2

Form	Euhedral, Prismatic
Colour	Blue, Red, yellow
Luster	Vitreo­us/­Ada­mantine
Streak	Colourless
Hardness	9
Cleavage	None
Fracture	Concho­ida­l/u­neven
Sp. Gravity	3.9-4.1
Chemical compos­ition	Al2O3

Form	Microc­rys­talline aggregate
Colour	Green, yellow, red
Luster	Waxy, dull
Streak	White
Hardness	6.5-7
Cleavage	None
Fracture	Conchoidal
Sp. Gravity	2.6
Chemical compos­ition	SiO2

Form	Dodeca­hedral
Colour	Red, Yellow
Luster	Vitreous
Steak	Colourless
Hardness	6.5-7.5
Cleavage	None
Fracture	Conchoidal
Sp. Gravity	3.5-4.3

Form	Foliated
Colour	Pale green, white, gray
Luster	Vitreo­us/­pearly
Steak	White to pale green
Hardness	1
Cleavage	Perfect
Fracture	Uneven
Sp. Gravity	2.7-2.8
Chemical compos­ition	Mg3Si4­O10­(OH)2

Form	Massive, Granular
Colour	Olive green
Luster	Vitreous
Steak	Colourless
Hardness	6.5-7
Cleavage	Poor
Fracture	Conchoidal
Sp. Gravity	3.2-3.4
Chemical compos­ition	(Mg,Fe­)2SiO4

Form	Massive, Granular
Colour	White, Purple, Green
Luster	Vitreous
Streak	White
Hardness	4
Cleavage	Perfect
Fracture	Sub-co­nch­oidal
Sp. Gravity	3.2
Chemical compos­ition	CaF2

Form	Tabular, Massive
Colour	White, Colour­less, Gray
Luster	Vitreous to Pearly
Streak	White
Hardness	2
Cleavage	Perfect
Fracture	Uneven
Sp. Gravity	2.3
Chemical Compos­ition	CaSO4.2H2O

Form	Prisma­tic­,Blocky
Colour	Colour­less, Green, White
Luster	Vitreous to pearly
Streak	White
Hardness	6
Cleavage	Perfect
Fracture	Conchoidal
Sp. Gravity	2.6
Chemical compos­ition	KAlSi3O8

Form	Prismatic
Colour	Various, balck, brown, green
Luster	Vitreous
Steak	White
Hardness	7-7.5
Cleavage	Poor/i­ndi­stinct
Fracture	Conchoidal
Sp. Gravity	2.9-3.3

Form	Massive, Rhombo­hedron
Colour	White, Colour­les­s,Gray
Luster	Vitreous
Streak	White
Hardness	3
Cleavage	Perfect
Fracture	Conchoidal
Sp. Gravity	2.7
Chemical compos­ition	CaCO3