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Citrine is a transparent, yellow variety of quartz. ... All quartz varieties have a hardness of 7 on the Mohs scale, while topaz has a hardness of 8. Origin
Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...
Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, ... Citrine was first appreciated as a golden-yellow gemstone in Greece between 300 ...
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.
Heat can either improve or spoil gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in "ametrine" – a stone partly amethyst and partly citrine.
The Vickers test can be used for all metals and has one of the widest scales among hardness tests. The unit of hardness given by the test is known as the Vickers Pyramid Number (HV) or Diamond Pyramid Hardness (DPH). The hardness number can be converted into units of pascals, but should not be confused with pressure, which uses the same units ...