Minerals

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Minerals

Rock Forming Minerals

make up earths crust

8 elements make up 98% and most rockforming minerals

O, Si, Al,Fe, Ca, Na, Mg, K

most abundant

Economic

Vitamins

organic

Food Minerals

often metals

Ca, K, Fe

inorganic compounds containing elements needed for life

Rock

rocks with non-mineral matter inc obsidian etc

solid mass of mineral or mineral-like matter

solid

ice!

inorganic

and naturally occuring

crystalline form

well defined chem composition

Characteristics

2ndary characteristics

chem reaction to HCl

carbonates will fizz

double refraction

feel

taste

magnetism

specific gravity

ratio of mineral weight to weight of equal vol of water

density

fracture

equally strong chemical bonds tend to fracture

cleavage

tendency to break along line of weak atomic bonds

hardness

ability to be scratched

tenacity

resistance to breaking

elastic

mica

sectile

talc - shavable

brittle

malleable

habit

crystal shape

LIGHT

translucent

transparent

opaque

STREAK

Subtopic

LUSTER

quality of light reflected - lustrous

silky

greasy

vitreous

glassy

earthy

pearly

nonmetallic

submetallic

metallic

COLOR

can be misleading