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“The most colorful mineral in the world” Class: Halides Color: Green, yellow, purple Cleavage: Perfect in 4 directions forming octahedrons Specific gravity: 3.1+ Hardness: 4 Streak: White. FLUORITE - CaF 2. FELDSPAR – Microcline KAlSi 3 O 8. Name given to most abundant group of minerals

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fluorite caf 2
“The most colorful mineral in the world”

Class: Halides

Color: Green, yellow, purple

Cleavage: Perfect in 4 directions forming octahedrons

Specific gravity: 3.1+

Hardness: 4

Streak: White

FLUORITE - CaF2
feldspar microcline kalsi 3 o 8
FELDSPAR – Microcline KAlSi3O8
  • Name given to most abundant group of minerals
  • Used for glass, ceramics, pottery, enamelware, soaps, abrasives, cements, fertilizer
  • Class: Silicates
  • Color: Off-white, yellow, pink, green, brown
  • Cleavage: Perfect in one and good in another direction forming nearly right angled prisms
  • Hardness: 6 – 6.5
  • Specific gravity: 2.5
  • Streak: white
hematite fe 2 o 3
HEMATITE - Fe2O3
  • Mined as main ore of iron
  • Comes from the Greek word for blood
  • Class: Oxides
  • Color: grey, black, red, brown
  • Cleavage: Absent
  • Specific gravity: 5.3
  • Hardness: 5 – 6
  • Streak: dark red
pyrite fes 2
Common world wide, aka Fool's Gold

Class: Sulfides

Color: Brassy yellow

Cleavage: Very distinct

Specific Gravity: 5.2

Hardness: 6 - 6.5

Streak: Brown, greenish-black

PYRITE - FeS2
quartz milky sio 2
Quartz is most common mineral and silicon is the 2nd most common element in the Earth's crust

Class: Silicates

Color: Various shades of white

Cleavage: None

Specific Gravity: 2.6

Hardness: 7

Streak: None

QUARTZ – MilkySiO2
calcite caco 3
4% by weight of Earth’s crust

Name comes from greek chalix meaning lime

Class: Carbonates

Color: White, yellow, brown, blue

Cleavage: Perfect in 3 directions forming rhombohedrons

Specific Gravity: 2.7

Hardness: 3

Streak: White

CALCITE - CaCO3
mica muscovite kal 2 alsi 3 o 10 f oh 2
Found in igneous, sedimentary, and metamorphic rock

Mica crystals are six-sided

Class: Silicates

Color: Colorless, yellow, brown

Cleavage: In 1 direction producing flakes or sheets

Specific gravity: 2.8

Hardness: 2- 2.5

Streak: None

MICA – Muscovite KAl2(AlSi3O10)(F, OH)2
magnetite fe 3 o 4
Magnetite - Fe3O4
  • Naturally magnetic
  • Class: Oxides
  • Color: Black
  • Cleavage: Absent
  • Specific gravity: 5.1
  • Hardness: 5.5-6.5
  • Streak: black
gypsum albaster caso 4
GYPSUM - AlbasterCaSO4
  • Gypsum has several variety names
  • Class: Sulfates
  • Cleavage: good in one direction and distinct in two others
  • Hardness: 2, can be scratched by fingernail
  • Specific Gravity: 2.3+
  • Streak: white
talc mg 3 si 4 o 10 oh 2
TALC - Mg3Si4O10(OH)2
  • Very Soft
  • Class: Silicates
  • Color: white, green, and gray
  • Cleavage: Perfect in one direction (break into clean sheets)
  • Hardness: 1 (softest mineral)
  • Specific gravity: 2.7 - 2.8 (average)
  • Streak: white
halite nacl
HALITE - NaCl
  • Salt
  • Class: Halides
  • Cleavage: Perfect in three directions forming cubes
  • Colorless, white, or pink
  • Specific Gravity: 2.1
  • Hardness: 2
  • Streak: white
mica biotite k fe mg 3 alsi 3 o 10 f oh 2
MICA – Biotite K(Fe,Mg)3AlSi3O10(F,OH)2
  • Class: Silicates
  • Color is green, brown, or black
  • Cleavage: perfect in 1 direction producing flakes or thin sheets
  • Specific gravity: 2.9 -3.4
  • Hardness: 2.5 – 3
  • Streak: none
graphite
Graphite
  • Class: Carbon
  • Cleavage is perfect in one direction
  • Color: black
  • Specific gravity: 2 – 2.3
  • Hardness: 1-2
  • Streak: black
gypsum selenite caso 4 2h 2 o
Gypsum – Selenite CaSO4·2H2O
  • Class: sulfates
  • Cleavage: distinct in two directions
  • Color: colorless
  • Specific gravity: 2.3
  • Hardness: 2
  • Streak: white
slide16
One of the world’s major sources of energy

Used to produce more than half of all the electrical energy that is generated and used in the United States.

COAL
diamond
It is the hardest substance known

Number 9 on Mohs' hardness scale

Diamond will cut through any material

DIAMOND