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Question:

where can i buy natural quartz crystal in chennai?

I am looking for natural quartz crystal for my table.

Answer:

To try and separate quartz and feldspar from granite on an industrial scale is simply not an economic possibility. The cost of the finished products would be many more times more expensive than getting quartz and feldspar from direct mining activities around the world even when transportation is taken into account. Sorry this one is a total non-starter.
Flotation is probably your best bet. In case you don't know, flotation is, (as the most basic example) mixing a crushed, or more or less finely ground, material with something like soapy water, Under the proper conditions, one component of the material will sink and another will float in the foam and can be therefore separated. However that was a gross simplification, additional treatment may be needed to get the material in a suitable condition, and the flotation medium may be far more exotic than soapy water.
Specific Gravity Of Feldspar
Froth Flotation Conventional reagent system alkylamine as collector and HF as activator for feldspar at pH2. Another non-HF reagent system such as nonionic flotation to float quartz at low PH, activation of quartz by alkaline earth cations in anionic flotation and others. You can visit google scholar of mine as (M.S. EL Salmawy)
If it really is just quartz and feldspar then it isn't granite its more like a pegmatite. There are ways to separate feldspar from quartz. You could try electrostatic separation. Or you could try froth flotation but you must get the conditions just right. If you don't the flotation agent (Cytec 3030C promoter is a good one) mistakes the quartz for feldspar and the separation isn't effective. Finally you could try dense fluid separation but you'd need to know accurately the specific gravity of the feldspar. Once you know that you can use a fluid with a specific gravity between the feldspar and quartz in which one sinks and the other floats. All of these techniques are commercially employed.

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