How can I identify Quartz on Mindat?
Quartz is one of the few minerals on Mindat where “visual identification” may be accepted as a method of identification for new locality entries and photos of well-formed crystals. In other cases, at least hardness should be checked, too. For quartz as a rock-forming mineral visual identification is often insufficient.
What is a scepter quartz?
Sceptre quartzes (American English spelling: Scepter quartzes) are crystals in which a second generation crystal tip grew on top of another quartz crystal. In a typical scepter quartz, the younger tip is larger than the first tip, but it may also be small… Earthy quartz, as nodular to mamillary masses, as coating on flint.
What are the characteristics of quartz?
If pure, quartz forms colorless, transparent and very hard crystals with a glass-like luster. A significant component of many igneous, metamorphic and sedimentary rocks, this natural form of silicon dioxide is found in an impressive range of varieties and colours. The Si analogue of pertoldite. 1.
What is the mechanism of reaction 1 dolomite + 2 quartz?
Lüttge, A., Metz, P. (1991) Mechanism and kinetics of the reaction 1 dolomite + 2 quartz = 1 diopside + 2 CO2 investigated by powder experiments. The Canadian Mineralogist: 29: 803-821.
Where did the Cahnite Crystal get its name?
Named for Lazard Cahn (1865-1940), mineral collector and dealer, Colorado Springs, Colorado, USA, who first noted the species. Comments: White, translucent cahnite crystal on hodgkinsonite. Location: Franklin, Sussex County, New Jersey, USA. Scale: Size Not Given. a = 7.095, c = 6.19, Z = 2; V = 311.60 Den (Calc)= 3.18
What is the heat capacity of quartz?
American Mineralogist: 72: 170-172. Hemingway, B.S. (1987) Quartz: Heat capacities from 340 to 1000 K and revised values for the thermodynamic properties. American Mineralogist: 72: 273-279.
What kind of quartz is found in Thunder Bay?
Journal of Earth Systems Science: 116: 497-510. Hebert L.B., Rossman G.R. (2008) Greenish quartz found at the Thunder Bay Amethyst Mine Panorama, Thunder Bay, Ontario, Canada. The Canadian Mineralogist: 46: 111-124.