G minerals

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Galena

from various origins.

Sulfide from hydrothermal origin. Main silver ore.

Chemistry : PbS
System : Cubic

Gibbsite

Alteration oxides of aluminous minerals or from hydrothermal or metamorphic environment.

Chemistry : Al(OH)3
System : Monoclinic

Goethite

from various origins.

Mineral from hydrothermal origin.

Chemistry : FeO (OH)
System : Orthorhombic

Gogotte

Concretions with strangely and pleasing shape consist of tiny quartz grains cemented.

Chemistry : SiO2 et CaCO3
System : -

Garnet

from various origins.

a metamorphic rock and pegmatite mineral..

Chemistry : X3Y2Si3O12
System : Cubic

Garnet from Italy

from various origins.

a metamorphic rock and pegmatite mineral..

Chemistry : X3Y2Si3O12
System : Cubic

Gypsum from Combronde

Gypsum from Combronde (France).

Mineral from evaporitic formations.

Chemistry: CaSO4 2H2O
System : Monoclinic

Gypsum flowers

from various origins.

Mineral from evaporitic deposits

Chemistry : CaSO4 2H2O
System : Monoclinic

Gypsum

from various origins.

Mineral from evaporitic deposits.

Chemistry : CaSO4 2H2O
System : Monoclinic

Gyrolite

from various origins.

Phyllosilicate from basaltic lavas.

Chemistry : NaCa16 (Si23Al)O60(OH)8 14H2O
System : Triclinic

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