Big Orange Hematoid Geode Cluster (Tangerine Quartz). 1.344 kg.
The physical properties of tangerine quartz are the same as those of quartz [silicon dioxide, SiO2], with the exception of its diagnostic, yellow-orange to orange colors, which are created by a uniform coating of particulate hematite [iron oxide, Fe2O3]. Tangerine quartz crystallizes in the hexagonal system and occurs mainly in granite pegmatites and metamorphic environments as short-to-long, horizontally striated, hexagonal, prismatic crystals with pyramidal terminations. It colors range from light yellow-orange to intense rusty orange. The quartz itself is transparent and colorless, but the hematite coating makes the crystals appear sub-transparent to sub-opaque. It has a Mohs hardness of 7.0, conchoidal fracture, dull luster, and specific gravity of 2.65. Tangerine quartz must not be confused with citrine, the golden-yellow gem variety of macrocrystalline quartz.
Please note: these are natural crystals with surface marks, small chips, pits, inclusions, fissures, vugs and druzy which adds to the character of the crystal. We do our best to capture them in a photo, but they may not show up properly. Please contact us prior to your purchase if you have questions or require more pictures.