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Mohs scale hardness: 6–7: Luster: Waxy, vitreous, dull, greasy, silky: ... The term chalcedony is derived from the name of the ancient Greek town Chalkedon in Asia ...
Mohs scale hardness: 6.0–7.0: Luster: Greasy, waxy: ... Chrysoprase, chrysophrase or chrysoprasus is a gemstone variety of chalcedony (a cryptocrystalline form of ...
Chrome chalcedony is a green variety of the mineral chalcedony, colored by small quantities of chromium. [4] Its name is derived from Mutorashanga, a small ferrochrome mining town in Zimbabwe where the mineral was discovered in the 1950s. [5] It is most commonly found in Zimbabwe, where it is known as Mtorolite, [6] Mtorodite, [7] or Matorolite ...
Mohs scale hardness: 6.5–7: Luster: Vitreous: Diaphaneity: Opaque to translucent: ... Other colors of chalcedony may also occur in Indian bloodstone, such as white ...
Mohs scale hardness: 6.5–7.0: Luster: Waxy to resinous: Streak: White: ... The red variety of chalcedony has been known to be used as beads since the Early ...
Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on 16 November 2024, at 12:16 (UTC). Text is available ...
Some solid substances that are not minerals have been assigned a hardness on the Mohs scale. Hardness may be difficult to determine, or may be misleading or meaningless, if a material is a mixture of two or more substances; for example, some sources have assigned a Mohs hardness of 6 or 7 to granite but it is a rock made of several minerals ...
Generally, dark navy blue chrysocolla is too soft to be used in jewelry, while cyan, green, and blue-green chrysocolla can have a hardness approaching 6, similar to turquoise. Chrysocolla chalcedony is a heavily silicified form of chrysocolla that forms in quartz deposits and can be very hard and approach a hardness of 7. [9] [10] [11]