Properties & Information
Dumortierite
DumortieriteSCIENCE / MINERALOGYDumortierite is an aluminum borosilicate mineral with a complex formula commonly represented as Al₇BO₃(SiO₄)₃O₃. It crystallizes in the orthorhombic system and commonly occurs as fibrous, columnar, or massive...
Dumortierite
DumortieriteSCIENCE / MINERALOGYDumortierite is an aluminum borosilicate mineral with a complex formula commonly represented as Al₇BO₃(SiO₄)₃O₃. It crystallizes in the orthorhombic system and commonly occurs as fibrous, columnar, or massive...
Dravite (Brown Tourmaline)
Dravite (Brown Tourmaline)SCIENCE / MINERALOGYDravite is the magnesium-rich brown member of the tourmaline group, ideally NaMg₃Al₆(BO₃)₃Si₆O₁₈(OH)₄. It crystallizes in the trigonal system and forms vertically striated prismatic crystals in brown,...
Dravite (Brown Tourmaline)
Dravite (Brown Tourmaline)SCIENCE / MINERALOGYDravite is the magnesium-rich brown member of the tourmaline group, ideally NaMg₃Al₆(BO₃)₃Si₆O₁₈(OH)₄. It crystallizes in the trigonal system and forms vertically striated prismatic crystals in brown,...
Dragon Stone
Dragon StoneSCIENCE / MINERALOGYDragon Stone is a trade name most commonly used for a green-and-red ornamental rock composed largely of epidote with red piemontite and/or iron-rich mineral phases. It is...
Dragon Stone
Dragon StoneSCIENCE / MINERALOGYDragon Stone is a trade name most commonly used for a green-and-red ornamental rock composed largely of epidote with red piemontite and/or iron-rich mineral phases. It is...
Dragi (Dragon) Jade
Dragi (Dragon) JadeSCIENCE / MINERALOGYDragi, or Dragon Jade, is a trade name applied to decorative jade material, commonly described as nephrite. Nephrite is not a single crystal species but a...
Dragi (Dragon) Jade
Dragi (Dragon) JadeSCIENCE / MINERALOGYDragi, or Dragon Jade, is a trade name applied to decorative jade material, commonly described as nephrite. Nephrite is not a single crystal species but a...
Dolomite
DolomiteSCIENCE / MINERALOGYDolomite is calcium magnesium carbonate, CaMg(CO₃)₂, and crystallizes in the trigonal system. It commonly forms curved rhombohedral crystals, saddle-shaped aggregates, and massive rock-forming material. The mineral dolomite is...
Dolomite
DolomiteSCIENCE / MINERALOGYDolomite is calcium magnesium carbonate, CaMg(CO₃)₂, and crystallizes in the trigonal system. It commonly forms curved rhombohedral crystals, saddle-shaped aggregates, and massive rock-forming material. The mineral dolomite is...
Dogtooth Calcite
Dogtooth CalciteSCIENCE / MINERALOGYDogtooth Calcite is a crystal-habit name for calcite, CaCO₃, that forms sharp scalenohedral crystals resembling pointed teeth. It is not a separate mineral species. Crystals may be...
Dogtooth Calcite
Dogtooth CalciteSCIENCE / MINERALOGYDogtooth Calcite is a crystal-habit name for calcite, CaCO₃, that forms sharp scalenohedral crystals resembling pointed teeth. It is not a separate mineral species. Crystals may be...