|
Stone |
Formula |
Group |
Other Information |
|
|
Variable |
Organic |
colourless-shell material found in warm
waters |
|
|
Ca2(Mg,Fe)5 Si8O22(OH)2 |
Silicates |
green-variety of nephrite |
|
|
SiO2 |
Silicates |
colour depends on impurities-form of chalcedony |
|
|
Ca SO42H2O |
Sulphates |
usually white-variety of gypsum-forms by evaporation |
|
|
Fe3Al2(SiO4)3 |
Silicates |
red-a garnet |
|
|
KAlSi3)8 |
Silicates |
green/turq-a feldspar |
|
|
- |
Organic |
yellow/brown-fossil resin of coniferous
trees |
|
|
SiO2 with Fe |
Oxides |
violet-variety of quartz-colour due to
presence of Fe oxide |
|
|
Ca3Fe2Si3O12 |
Silicates |
green/black-member of the garnet family |
|
Angelite |
CaSO4 |
Sulphates |
aka anhydrate light blue-similar to gypsum
|
|
Annabergite |
Ni3(AsO4)2 8H2O |
Arsenates |
white/green-forms in nickel veins |
|
|
Ca5(PO4)3 (F,Cl,OH) |
Phosphates |
colourless (appears blue/green)-source of phosphorous |
|
Apophyllite |
KCa4Si8O20 (FOH)8H2O
|
Silicates |
white/colourless-usually transparent |
|
|
Be3Al2Si6)18 |
Oxides |
blue variety of beryl |
|
|
CaCO3 |
Carbonates |
colourless-similar to calcite-different
crystal structures |
|
|
- |
Sedimentary |
a sandstone-(feldspar and quartz)-forms in bedding
layers |
|
Astrophyllite |
(K,Na)3 (Fe,Mn)7Ti2Si8 O24(O,OH)7 |
Silicates |
forms bladed crystals-bronze to golden
yellow |
|
|
Cu2Cl(OH)3 |
Halides |
green-an evaporite-source of copper |
|
|
(Ca,Mg,Fe )2Si2O6 |
Silicates |
dark green/black-a pyroxene-formed beneath
surface |
|
|
SiO2 with inclusions |
Oxides |
brown/green-colour due to inclusions |
|
|
Cu3(CO3) 2(OH)2
|
Carbonates |
blue-source of copper-known as blue malachite |
|
|
BaSO4 |
Sulphates |
white-source of barium |
|
|
- |
Extru Igneous |
black/brown-formed from solidified lava |
|
|
Be3Al2Si6O18 |
Silicates |
colourless-source of beryllium |
|
|
K(Mg,Fe)3Al Si3O10(OH,F)2 |
Silicates |
black/brown-mica |