Quartz crystals, this material is ordinarily trasparent or strongly traslucent.The chief varieties in this category are based on color, such as amethyst, citrine and smoky quartz . In additions, there are varieties of more or less significance, sometimes designated by specific names, that are based on feature of crystal habit or twinning aggregation or presence of inclusions |
quarzo cristalli indice |
index quartz crystals |
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