Oxides/Hydroxides Flashcards
1
Q
Cuprite
A
Cu2O
- dark crystals, black to purpleish
- large obvious crystals
- sub-metallic
- brownish-red streak
- octahedral
2
Q
Periclase
A
MgO
- occurs in contact metamorphics
- grayish-white, granular
3
Q
Zincite
A
ZnO
-small reddish chunks
4
Q
Corundum
A
Al2O3
- different colors
- prismatic
- columnar
5
Q
Hematite
A
Fe2O3
- metallic and sparkly to dull and reddish
- red streak
6
Q
Ilmenite
A
FeTiO3
- grey-black with green
- granular
- sub-metallic
- black streak
7
Q
Spinel
A
MgAl2O4
- light and dark green mixed with white
- no cleavage, just fractures
8
Q
Gahnite
A
ZnAl2O4
- rusty, dark green
- flaky grains
9
Q
Chromite
A
FeCr2O4
- very heavy, high specific gravity
- metallicy grey
10
Q
Magnetite
A
Fe2+Fe23+O4
- magnetic!
- blackish grey, brown tint
11
Q
Rutile
A
TiO2
- tetragonal crystals, pyramids
- metallic, foliated crystals
12
Q
Pyrolusite
A
MnO2
- dark grey, metallic, shimmery
- knobby
13
Q
Cassiterite
A
SnO2
- no hand sample
- black-brown-reddish
- prismatic, radially fibrous crusts
14
Q
Brucite
A
Mg(OH)2
- white, pale grey
- sheets of Mg octahedral
- tabular, fibrous
- soft, scratches with fingernail
- looks like talc
15
Q
Diaspore
A
AlO(OH)
- platey, foliated crystals
- tan-beige
16
Q
Goethite
A
FeO(OH)
- brownish-black
- can appear as nodules, prismatic, radial crystals
- black to brown
17
Q
Manganite
A
MnO(OH)
- steel-grey to black
- fibrous, slender crystals
- sub-metallic
- leaves shit on hands
