Minerals Flashcards Preview

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Flashcards in Minerals Deck (25):
1

Define a mineral

naturally occurring inorganic solid with definite chemical composition and regularly repeating atoms

2

Minerals are made up of

elements

3

There are how many known minerals

3800

4

What are 8 different tests to identify minerals

streak, hardness, luster, color, cleavage/fracture, crystal structure, special properties, specific gravity

5

some minerals are gemstones when...

they are in their crystal form, cut and polished

6

gemstones are any stone with one of two values

economic or aesthetic

7

Are all gemstones minerals?

NO

8

rubies and sapphires come from the mineral

corundum

9

trace amounts of what turn corundum blue

iron and titanium

10

what turns corundum pink and deep red ruby

chromium

11

What minerals are gemstones in their pure form?

diamond, topaz, turquoise

12

What is the softest of all minerals and what is it used for?

talc used as talcum/baby powder

13

quarts crystals have a property called

piezoelectricity

14

What does piezoelectricity mean?

when quartz is placed under mechanical stress, it creates electricity.

15

What is quartz used in?

clocks, watches, radios

16

What is halite used for

rock salt on roadways

17

graphite is used in...

pencil lead

18

what is the most important ore of lead

galena

19

galena lead is most commonly used for

lead acid batteries

20

galena is mined for its....

...silver

21

what minerals are mined for iron?

magnetite, hematite and limonite

22

what mineral is used in drywall, cement and plaster of paris

gypsum

23

what form of gypsum is often used in ornamental pieces--very soft (2)

alabaster

24

Mohs hardness scale measures what

hardness/softness--the mineral that is hardest will leave scratch on softer mineral

25

Name hardness scale 1--10

1. talc
2. gypsum
2.5 finger nail
3 calcite
3.5 copper penny
4 flourite
5 apatite
5.5 glass
6 feldspar
6.5 steel nail
7 quartz
8 topaz
9 corundum
10 diamond