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Rock Identification Test > sheet sillicates > Flashcards

sheet sillicates Flashcards

1
Q

what are the main mineral groups within the sheet sillicates?

A
  1. micas
  2. clays
  3. serpentine
  4. chlorite
  5. talc
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2
Q

what property do ALL the sheet sillicates share?

A

they all have one cleavage direction between the sheets

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3
Q 
a sheet sillicate has the following properties, what is it? 
habit: 
- anhedral massive structure 
aggregation:
 - massive 
colour:
- light grey with a white streak 
mustre:
- greasy to pearly 
cheavage:
- one very poorly formed direction 
hardness: 
- 1/2 crumbles under finger nail
A

talc

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4
Q

talc and mesolite (a zeolite ) both have a hardness of one, how would you distinguish between the two?

A

mesolite have a raidal aggregation with a fibrous habit whereas talc is commonly massive
colour and lustre are also very different from one another

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5
Q 
a sheet sillicate has the follwing properties, identify it:
habit:
- elongated/prismatic 
aggregation:
- granular 
colour:
- very distinctive shade of plae green
- no streak
lustre:
pearly/silky/greasy
hardness:
- 2.5-3.5 meaing can be scratched by finger nail or steel nail
cleavage:
-one direction ranging from poor to perfect
A

serpentine

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6
Q

what are the diagnostic properties of serpentine?

A

hardness is very soft at 2-4
its very distinct pale green lustre
the silky/green lustre

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7
Q 
identify the sheet sillicate from the following properties:
habit:
- anhedral, unique habit not visible 
aggregation:
- massive 
colour:
- dark grey with hints of green
- green streak 
hardness:
- 1/2 (scratched by finger nail)
lustre:
- ranges pearly/vitreous/dull
cleavage:
- one perfect direction
A

Chlorite

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8
Q

what are the diagnostic properties of chlorite?

A
  1. its dark colour BUT with a weird greenish tint/reflection
  2. GREEN STREAK
  3. very soft, hardness 1-2
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9
Q

chlorite and oxides can look very similar, how could you distinguish between them?

A
  1. chlorite is (i think) the only mineral to leave a green streak
  2. CHLORITE IS VERY SOFT
  3. chlorite has one definite cleavage direction
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10
Q

which two clay minerals do we have specimines for and thus you should be able to identify?

A

celadontie

kyanite

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11
Q

what are the diagnositc properties of kalonite, and what group does it belong to?

A

the lab specimine looks like a block of cheese, but apart from that it is almost always:

  • massive
  • very crumbly in your hands
  • super soft with hardness 1-2
  • really just looks like a big block of white
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12
Q

what does the lab sample of celadonite look like?

A

its a basically is a grey rock with these weird circles/ hollows of a very distinctive and bright green rock inside

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13
Q 
identify the following sheet sillicate: 
habit:
- isometirc/ circular shaped crystals 
aggregation:
- one of the samples appears botryoidal
colour:
very distinct pale green colour 
- streak: is green
lustre:
- earthy/dull
cleavage:
- none visible in either of the lab specimines but should be one direction 
hardness:
- 3/4, scratched by steel nail
A

celadonite

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14
Q

two of the sheet sillicates leave a green sheet. name them, and the properties that should allow you to NOT mistake them for one another

A

celadonite and chlorite.

  1. celadnoite is a much brighter green than the dark chlorite
  2. celadonte has hardness 3/4 and chlorite 1/3
  3. the chlorite specimine looks massive whereas the celadonite one doesnt
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15
Q

which are the two micas you need to know?

A

biotite and muscovite

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16
Q 
ideontify the following sheet sillicate: 
habit:
- platy
- subhedral/euhedral
colour:
- black/brown in hand specimine but pale in sheets 
hardness:
- 1/2 (scratched by finger nail)
lustre:
- typically pearly 
cleavage:
- one perfect/good direction
A

biotite

17
Q 
identify the following sheet sillicate: 
habit:
- platy/ hexagonal sheets 
colour: silverish but can also be dark 
lustre:
- vitreous 
hardness:
- 3/4
cleavage:
one perfect direction
A

muscovite

18
Q

muscovite and biotite are VERY similar to one another. how could you tell them apart in the exam

A
  1. when not in sheets, biotite is darker and muscovite paler

2. biotite has a hardness 1/2 muscovite is 3/4 (so if the colour look rlly similar THIS should tell them apart)

Rock Identification Test (14 decks)

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