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Corel Day 2 > hydroxides > Flashcards

hydroxides Flashcards

1
Q

how to distinguish oxides from hydroxides

A

the presence of OH- or H2O molecules

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2
Q

what is the effect of OH- in the bonds

A

weakens them

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3
Q

brucite formula

A

Mg (OH)2

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4
Q

brucite form

A
  • hexagonal, tabular
  • more commonly foliated massive
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5
Q

brucite cleavage

A

basal perfect. sectile, flexible folia not elastic

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6
Q

brucite hardness

A

2.5

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7
Q

brucite specific gravity

A

2.39

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8
Q

brucite color

A
  • pearly on base, waxy and vitreous elsewhere
  • white gray light green
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9
Q

brucite occurrence

A
  • in assoc with serpentine dolomites, magnetite and chromite
  • reaction product of Mg silicates, esp serpentine
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10
Q

brucite remarks

A

foliated nature, light color, pearly on cleavage

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11
Q

how to tell brucite from talc

A

brucite is harder (2.5) talc is 1

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12
Q

how to distinguish brucite from mica?

A

brucite is inelastic

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13
Q

manganite formula

A

MnO (OH)

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14
Q

manganite form

A
  • monoclinic, prismatic parallel to c, vertically striated
  • often columnar to coarse, fibrous
  • contact and penetration twins common
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15
Q

manganite cleavage

A

perfect pinacoidal

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16
Q

manganite hardness

A

4

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17
Q

magnanite specific gravity

A

4.3

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18
Q

manganite color

A
  • metallic, opaque
  • steel gray to iron black. streak is dark brown
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19
Q

manganite occurrence

A
  • in manganese deposits assoc eith other mn oxides and hydroxides
  • in low temp veins assoc with barite, siderite and calcite
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20
Q

manganite occurrence

A
  • manganese deposits assoc with other Mn-oxides and hydroxides
  • in low-temperature hydrothermal veins associated with barite, siderite, and calcite
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21
Q

what does manganite commonly alter into

A

pyrolusite

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22
Q

manganite remarks

A

black color, prismatic, 4 hardness

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23
Q

how to distinguish manganite from pyrolusite

A

pyrolusite has iron black streak, manganite has dark brown streak

24
Q

romanechite formula

A

basta Ba, H2O, mn 4+ 3+ and O10

25
Q

romanechite form

A

amorphous, massive botryoidal, stalactitic

26
Q

romanechite hardness

A

5-6

27
Q

romanechite specific gravity

A

3.7 to 4.7

28
Q

romanechite color

A

submetallic opaque. black
brownish black streak

29
Q

romanechite occurrence

A
  • from secondary alteration of original Mn-carbonates, Mn-silicates, or both
  • in assoc with pyrolusite in manganese ore deposits
  • in nodular deposits in bogs, and on lake bottoms and on see and ocean floors
30
Q

former term for the hard botryoidal masses of which are mixtures of manganese oxides of which romanechite is a major constituent

A

psilomelane

31
Q

how to distinguish romanechite from other manganese oxides?

A

its hardness and botryoidal form

32
Q

how to distinguish romanechite from limonite

A

romanechite has a brownish black streak

33
Q

geothite formula

A

FeO (OH)

34
Q

geothite form

A
  • rarely orthorhombic prismatic, vertically striated
  • massive, reniform, stalactitic in radiating fibrous aggregation
  • foliated
35
Q

loose and porous geothite

A

bog ore

36
Q

geothite cleavage

A

pinacoidal perfect

37
Q

geothite hardness

A

5 to 5.5

38
Q

geothite specific gravity

A

4.37, if impure as low as 3.3

39
Q

geothite color

A
  • adamantine to dull, silky, scaly fibrous
  • yellowish brown to dark brown
  • yellowish brown streak. subtranslucent
40
Q

geothite occurrence

A
  • common resulting from oxidation and weathering of iron bearing minerals
  • widespread in bogs and around springs
41
Q

where is geothite in metalliferous vein deposits?

A

the iron hat, the gossan

42
Q

how to distinguish geothite from colloform hematite and romanechite

A

hematite is black to brownish red
geothite is yellowish brown to black and
romanechite is just black

43
Q

limonite formula

A

FeO (OH) nH2O

44
Q

field term used for very fine grained to amorphous mictures of brown ferric hydroxides with unknown real identities

A

limonite

45
Q

commonly, what is the biggest composition of limonite

A

geothite

46
Q

T or F bauxite is a mineral/mineral species

A

F, it is a rock term

47
Q

bauxite consists of very fine grained intergrowth of three aluminum oxides, what are they

A

diaspore, gibbsite and boehmite

48
Q

bauxite is what type of ore

A

major aluminum ore

49
Q

bauxite form

A
  • micture, pisolitic round concretionary grains
  • also massive, earthy claylike
50
Q

bauxite hardness

A

1-3

51
Q

bauxite specific gravity

A

2 to 2.55

52
Q

bauxite color

A

dull earthy
- white gray red yellow

53
Q

what causes yellow color of bauxite

A

limonite staining

54
Q

bauxite occurrence

A
  • eupergene, in subtropical or tropical conditions, prolonged weathering and leaching of silica from aluminum bearing rocks
55
Q

soil consisting mainly of hydrous aluminum and ferric oxides

A

laterite

56
Q

bauxite remarks

A

light, yellowish brown color, pisolitic, earthy tecture and low degree of hardness

Corel Day 2 (17 decks)

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