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The word garnet comes from the 14th-century Middle English word gernet, ... this mineral group shows a range of hardness on the Mohs scale of about 6.0 to 7.5. [13]
Tsavorite garnet on real matrix of silvery black graphite and a minor blue apatite. General; ... Mohs scale hardness: 7.0–7.5 [1] Specific gravity: 3.60–3.68 [1]
Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.
Mohs scale hardness: 7.0–7.5: Luster: greasy to vitreous: ... Rhodolite is a varietal name for rose-pink to red mineral pyrope, a species in the garnet group.
Mohs's scale had two limitations: it was not linear, and most modern abrasives fall between 9 and 10.; [6] [7] so, later scientists attempted to increase resolution at the harder end of the scale. Raymond R. Ridgway, a research engineer at the Norton Company, modified the Mohs scale by giving garnet a hardness of 10 and diamond a hardness of 15.
Spessartine forms a solid solution series with the garnet species almandine. [4] [5] Well-formed crystals from this series, varying in color from very dark-red to bright yellow-orange, were found in Latinka, Rhodope Mountains, Kardzhali Province, Bulgaria. [12] Spessartine, like the other garnets, always occurs as a blend with other species.
Gadolinium Gallium Garnet (GGG, Gd 3 Ga 5 O 12) is a synthetic crystalline material of the garnet group, with good mechanical, thermal, and optical properties. It is typically colorless. It has a cubic lattice, a density of 7.08 g/cm 3 and its Mohs hardness is variously noted as 6.5 and 7.5.
Hessonite has a similar hardness to that of quartz (being about 7 on the mohs scale), while the hardness of most garnet species is nearer 7.5. [5] Hessonite comes chiefly from Sri Lanka and India, where it is found generally in placer deposits, though its occurrence in its native matrix is not unknown. [5] It is also found in Brazil and California.
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