Tag
opal
2 pieces touching this thread.
Crystal GuidesOctober Birthstone, Opal and Tourmaline Across Their Wild Colour Range
October has two birthstones, opal and tourmaline. A careful look at the mineralogy, the colour ranges, sources, and how to choose a piece worth keeping.
Crystal GuidesOpal, the Stone of Living Light
A hydrated silica that produces colours no other crystal can match through pure structural diffraction. The mineralogy behind play-of-colour, the major varieties from Australian to Ethiopian to Mexican fire, and how to choose carefully.