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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Sajan sarthak Best Answer
You have to remember all the properties of hardness scale minerals.. 1.Talc 2 .Gypsum 3.Calcite 4.Fluorite 5.Apatite 6.Orthoclase 7.Quartz 8.Topaz 9.Corondum 10.Diamond 2,7,8 are optically positive and from the cystal system you can know the optical uniaxial or biaxial.. and it's uniaxial negative