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DAY 2: FINAL EXAM > HYDROXIDES > Flashcards

HYDROXIDES Flashcards

1
Q

Mg(OH)2

A

Brucite

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2
Q

Commonly foliated, massive. When in crystals, they are hexagonal, usually tabular on {0001}

A

crystal form of brucite

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3
Q

What is the cleavage of brucite?

A

Basal {0001} perfect. Folia flexible but not elastic. Sectile.

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4
Q

What is the hardness of brucite?

A

2 1/2

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5
Q

What is the specific gravity of brucite?

A

2.39

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6
Q

What is the usual color of brucite?

A

White, gray, light green. Luster on base pearly, elsewhere vitreous to waxy.

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7
Q

Found in association with serpentine dolomite, magnetite, and chromite. As a reaction product of Mg-silicates, especially serpentine.

A

Brucite

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8
Q

MnO(OH)

A

Manganite

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9
Q

Monoclinic crystals that are prismatic parallel to the c axis and vertically striated. Often columnar to coarse – fibrous.

A

crystal form of manganite

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10
Q

What is the cleavage of manganite?

A

Pinacoidal {010} perfect, {110} and {001} good

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11
Q

What is the hardness of manganite?

A

4

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12
Q

What is the specific gravity of manganite?

A

4.3

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13
Q

What is the usual color of manganite

A

Steel gray to iron black.

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14
Q

In manganese deposits associated with other Mn-oxides and hydroxides. Also in low-temperature hydrothermal veins associated with barite, siderite, and calcite. It commonly alters to pyrolusite.

A

Manganite

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15
Q

(Ba,H2O)2(Mn4+,Mn3+)5O10

A

Romanechite

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16
Q

Massive, botryoidal, stalactitic; appears amorphous.

A

Romanechite

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17
Q

What is the hardness of romanechite?

A

5-6

18
Q

What is the specific gravity of romanechite?

A

3.7-4.7

19
Q

What is the usual color of romanechite?

A

Black. Opaque. Luster submetallic. Streak brownish black.

20
Q

A product of secondary alteration of original Mn-carbonates, Mn-silicates, or both. Generally in association with pyrolusite in manganese ore deposits, in nodular deposits in bogs, and on lake bottoms and on see and ocean floors.

A

Romanechite

21
Q

Mixtures of manganese oxides of which romanechite is a major constituent.

A

psilomelane

22
Q

FeO(OH)

A

Goethite

23
Q

Rarely in distinct prismatic (orthorhombic), vertically striated crystals. Generally massive, reniform, stalactitic, and in radiating fibrous aggregation.

A

crystal form of geothite

24
Q

Goethite is also called ________ generally loose and porous.

A

bog ore

25
Q

What is the cleavage of goethite?

A

Pinacoidal {010} perfect

26
Q

What is the hardness of goethite?

A

5 - 5 1/2

27
Q

What is the specific gravity of goethite?

A

4.37, but may be as low as 3.3 for impure material

28
Q

What is the usual color of goethite?

A

Yellowish brown to dark brown. Luster adamantine to dull, silky in some fine, scaly, or fibrous varieties.

29
Q

A common mineral resulting from oxidation and weathering of iron-bearing minerals. It is a widespread deposit in bogs and around springs

A

Goethite

30
Q

Goethite constitutes the gossan or “________” over metalliferous vein deposits.

A

iron hat

31
Q

FeO(OH)·nH2O

A

Limonite

32
Q

___________ field term used for very fine-grained to amorphous mixtures of brown ferric hydroxides whose real identities are unknown

A

limonite

33
Q

Limonite, therefore, has variable compositions (and variable chemical and physical properties) and consists of a mixture of several iron hydroxides (commonly with _________ a major constituent)

A

goethite

34
Q

Al2O3. 2H2O

A

Bauxite

35
Q

Bauxite consists of a very fine-grained intergrowth of three aluminum hydroxides, ______, _________, and _______

A

diaspore, gibbsite, boehmite

36
Q

A mixture. Pisolitic, in round concretionary grains. Also massive, earthy, claylike.

A

Bauxite

37
Q

What is the hardness of bauxite?

A

1-3

38
Q

What is the specific gravity of bauxite?

A

2-2.55

39
Q

What is the color of bauxite?

A

White, gray, yellow, red. Yellow color caused by limonite staining.

40
Q

__________ is of supergene origin, commonly produced under subtropical to tropical conditions by prolonged weathering and leaching of silica from aluminum-bearing rocks

A

bauxite

DAY 2: FINAL EXAM (13 decks)

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