Corundum, topaz, orthoclase, quartz Fluorite, orthoclase, quartz, topaz. Quartz, corundum, topaz, diamond. Diamond, corundum, quartz, topaz. Talc, gypsum, fluorite, calcite. A gemstone that floats on top of a heavy liquid has a specific gravity that is the same as the liquid.
Asterism is caused by the presence of more than one chromophore.
Gem labradorite feldspar and opal owe their unique color displays to aventurescence. Aventurescence is a phenomenon caused by reflective mineral inclusions. Color in allochromatic minerals and gems is a diagnostic property that can aid in mineral or gem identification. Color centers are the source of color in minerals that contain transition elements. are ideochromatic. are capable of diffracting light. Absorption of light by chromophores to produce color occurs within the nucleus of the chemical element that is the chromophore.