A minerals
Adamite
from various origins
Mineral from zinc and arsenic deposits.
Chemistry : Zn2OHAsO4
System : Orthorhombic
Aegyrine
from various origins
The aegirine pyroxene is characteristic of alkaline rocks.
Chemistry : NaFeSi2O6
System : Monoclinic
Agate
from various origins
Agate is a chalcedony variety with various colors.
Chemistry : SiO2
System : Trigonal
Agatized Fossils
Fossils transformed into agate during hydrothermal process.
Chemistry : SiO2
System : Trigonal
Fire Agate
from various origins
Fire agate is an iridescent chalcedony variety.
Chemistry : SiO2
System : Trigonal
Aquamarine
from various origins
Blue beryl variety from pegmatites. Blue color is due to iron.
Chemistry : Be3Al2Si6O18
System : Hexagonal
Allanite
REE mineral from various origins.
Chemistry : (Ce,Ca,Y,La)2
(Al,Fe3+)3 (SiO4)3(OH)
System : Monoclinic
Amethyst from Pégut
Amethyst is a purple variety of quartz whose color is due to the presence of iron.
Chemistry : SiO2
System : Trigonal
Amethyst from Les Isserts
Amethyst is a purple variety of quartz whose color is due to the presence of iron.
Chemistry : SiO2
System : Trigonal
Hematoid Amethyst
Amethyst is a purple variety of quartz whose color is due to the presence of iron.
Chemistry : SiO2
System : Trigonal
Amethyst from Mexico
Amethyst is a purple variety of quartz whose color is due to the presence of iron.
Chemistry : SiO2
System : Trigonal
Amethyst
from various origins
Amethyst is a purple variety of quartz whose color is due to iron.
Chemistry : SiO2
System : Trigonal
Ametrine
Two quartz crystals twinned : citrine and amethyst.
Chemistry : SiO2
System : Trigonal
Analcime
Primary and secondary mineral from lavas. Also occurs in sedimentary rocks.
Chemistry : NaAlSi2O6 H2O
System : Cubic
Anatase
from various origins
Titanium oxides from gneisses, micashistes or pegmatites.
Chemistry : TiO2
System : Tetragonal
Anglesite
from various origins
Formed by oxidation of galena in oxidation areas of lead deposits.
Chemistry : PbSO4
System : Orthorhombic
Apatite
Apatite is a widely occurring pale green to purple mineral.
Chemistry : Ca5(PO4)3 (OH,Cl,F)
System : Hexagonal
Apophyllite
Mineral group from basic volcanic rocks or hydrothermal mineral.
Chemistry : (K, Na)Ca4 Si8O20(OH, F) 8H2O
System : Tetragonal
Aragonite
from various origins
High pressure dimorph of calcite.
Chemistry : CaCO3
System : Orthorhombic
Native silver (argent)
from various origins
Native element from hydrothermal origin.
Chemistry : Ag
System : Cubic
Axinite
Cyclosilicate from metamorphic areas or metasomatic deposits.
Chemistry: Ca2(Fe,Mg,Mn) Al2[BO3OH,Si4O12]
System : Triclinic
Azurite
from various origins
Oxidation mineral from copper deposits.
Chemistry: Cu3(CO3)2(OH)2
System : Monoclinic
French azurite
from Chessy, Cap Garonne, etc...
Oxidation mineral from copper deposits.
Chemistry: Cu3(CO3)2(OH)2
System : Monoclinic
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