hi everybody, some mineral class very tick you can't judge base on this way. I have one very accurate way to test ( i think), put one drop of water on crystal, the water will abit 'concentrate' like small ball. If mineral crystal, water will 'flat' like 'spoiled egg'...Try it with two different class you will know
[COLOR="DarkOrange"][FONT="Comic Sans MS"]horology concept[/FONT][/COLOR]
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