Properties & Information
Ametrine
AmetrineSCIENCE / MINERALOGYAmetrine is a natural bicolored quartz variety containing zones of purple amethyst and yellow-to-orange citrine in the same crystal. Both colors are produced by different oxidation states and...
Ametrine
AmetrineSCIENCE / MINERALOGYAmetrine is a natural bicolored quartz variety containing zones of purple amethyst and yellow-to-orange citrine in the same crystal. Both colors are produced by different oxidation states and...
Amegreen
AmegreenSCIENCE / MINERALOGYAmegreen is a trade name used for mixed quartz material displaying purple amethyst, green quartz commonly marketed as prasiolite, and clear or milky quartz. It is therefore not...
Amegreen
AmegreenSCIENCE / MINERALOGYAmegreen is a trade name used for mixed quartz material displaying purple amethyst, green quartz commonly marketed as prasiolite, and clear or milky quartz. It is therefore not...
Amblygonite
AmblygoniteSCIENCE / MINERALOGYAmblygonite is a lithium-aluminum phosphate mineral in a solid-solution series with montebrasite. The simplified formula is (Li,Na)AlPO₄(F,OH), with amblygonite representing the more fluorine-rich side and montebrasite the more...
Amblygonite
AmblygoniteSCIENCE / MINERALOGYAmblygonite is a lithium-aluminum phosphate mineral in a solid-solution series with montebrasite. The simplified formula is (Li,Na)AlPO₄(F,OH), with amblygonite representing the more fluorine-rich side and montebrasite the more...
Amber Calcite
Amber CalciteSCIENCE / MINERALOGYAmber Calcite is a color-based trade name for honey- to amber-colored calcite, CaCO₃. Calcite crystallizes in the trigonal system, has perfect rhombohedral cleavage, strong double refraction in...
Amber Calcite
Amber CalciteSCIENCE / MINERALOGYAmber Calcite is a color-based trade name for honey- to amber-colored calcite, CaCO₃. Calcite crystallizes in the trigonal system, has perfect rhombohedral cleavage, strong double refraction in...
Allophane
AllophaneSCIENCE / MINERALOGYAllophane is a poorly crystalline to amorphous hydrous aluminum silicate rather than a conventionally well-ordered crystal mineral. Its composition is variable, and it commonly occurs as earthy, waxy,...
Allophane
AllophaneSCIENCE / MINERALOGYAllophane is a poorly crystalline to amorphous hydrous aluminum silicate rather than a conventionally well-ordered crystal mineral. Its composition is variable, and it commonly occurs as earthy, waxy,...
Amber
AmberSCIENCE / MINERALOGYAmber is fossilized tree resin, an organic gem material rather than a mineral because it lacks a fixed crystalline structure and uniform chemical formula. It is composed primarily...
Amber
AmberSCIENCE / MINERALOGYAmber is fossilized tree resin, an organic gem material rather than a mineral because it lacks a fixed crystalline structure and uniform chemical formula. It is composed primarily...