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Mohs Hardness Comparison Chart/Review of Abrasives at READE Silica sand 6 7 Silicon Most abrasives that effectively achieve an anchor pattern on a surface
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We all think we know quartz and can recognise it but it has possibly greater variation than any other mineral First it is only one of several different silica
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Glossary Appraisals A gemstone made of the mineral hydrated silica Devised by German mineralogist Friedrich Mohs the Mohs Scale grades minerals on a
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Opal is a hydrated amorphous form of silica its water content may range from 3% to 21% by weight but is usually between 6% and 10% Because of its amorphous
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Durability and Care The hardness of an Opal ranges from 6 on The Mohs Scale making them a fairly soft stone in comparison to say Sapphires and
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Definition of OPAL A usually amorphous mineral that is a hydrated silica softer and less dense than quartz and typically with definite and often marked
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Opal more than any other gemstone is distinctly an individual No other stone has as rich and varied a folklore Precious opal displays rainbow like hues that
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Quartz crystalline silica or SiO 2 is the most common single mineral of the continental crust It is unusually hard for a white/clear mineral hardness 7 on the
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Opal Facts And Care Opal is a soft multicolored gemstone Opal is hydrated silica it has a very high water content In rare cases up to 20% of the weight can
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Opal Gemology Myths Sources Choosing tips Translucent mineral consisting of hydrated silica of variable color Hardness Mohs scale 5 5 6 5