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A Level Geology OCR > Minerals > Flashcards

Minerals Flashcards

1
Q

Which two minerals are a silicon tetrahedra?

A

Olivine

Garnet

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2
Q

Which mineral has silicon chains?

A

Pyroxene

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3
Q

Which two minerals have silicon sheets?

A

Mica

Clay

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4
Q

Which two minerals have silica frameworks?

A

Quartz

Feldspar

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5
Q

What is a mineral?

A

A naturally occurring chemical substance having a definite chemical composition and crystalline structure

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6
Q

What is the angle between faces in quartz?

A

60º

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7
Q

What is a grain boundary?

A

The line of contact between mineral crystals in a rock

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8
Q

What lustre does galena have?

A

Metallic

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9
Q

What are the eight diagnostic features of minerals?

A

Colour

Streak

Lustre

Shape

Cleavage and fracture

Hardness

Density

Reaction with acid

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10
Q

What is the shape of quartz?

A

Irregular

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11
Q

What is the colour of quartz?

A

White/grey

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12
Q

What is the hardness of quartz?

A

7

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13
Q

What is the cleavage/fracture of quartz?

A

None/irregular

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14
Q

What is the lustre of quartz?

A

Vitreous/shiny

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15
Q

What is the streak of quartz?

A

None

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16
Q

What is the shape of feldspar?

A

Rectangular

17
Q

What is the shape of mica?

A

Sheets/flakes

18
Q

What is the shape of augite (pyroxene)?

A

Square

or eight sided in cross section

19
Q

What is the shape of hornblende?

A

Diamond shape in cross section

20
Q

What is the shape of olivine?

A

Round

21
Q

What is the shape of calcite?

A

Irregular/rhombic

22
Q

What is the shape of garnet?

A

Rounded

or six sided in cross section

23
Q

What is the shape of kyanite?

A

Flat/blades

24
Q

What is the colour of augite?

A

Dark green to black

25
Q

What colour is hornblende?

A

Green to black

26
Q

What colour is olivine?

A

Yellow green

27
Q

What colour is calcite?

A

White

Grey

Transparent

28
Q

What colour is garnet?

A

Deep red to brown

29
Q

What colour is kyanite?

A

Blue

White

Grey

30
Q

What is the cleavage of feldspar?

A

Two directions

31
Q

What is the cleavage of mica?

A

Good in one direction

32
Q

What is the cleavage of augite?

A

Two at almost 90º

33
Q

What is the cleavage of hornblende?

A

Two directions at about 60º

34
Q

What is the cleavage of olivine?

A

Poor

35
Q

What is the cleavage of calcite?

A

Three directions

36
Q

What is the cleavage of garnet?

A

None

37
Q

What is the cleavage of kyanite?

A

Two directions

38
Q

What lustre do all of the minerals have?

A

Vitreous

39
Q

What streak do all of the minerals excluding quartz have?

A

White

A Level Geology OCR (15 decks)

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