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Common Opal is a mineral found in abundance and as a filler between many
varieties of rocks. It resembles Quartz, but is softer. Precious Opal, however,
is quite rare and sources seem to be limited to the Western United States and
Mexico. Dark coloured Opal with a vivid play of colour is referred to as Black
Opal. Opals with a pale colour and a vivid colour play are referred to as White
Opals. Fire Opal is the name given to the orange to red variety with an internal
play of colour. The appearance of coloured sparks within the Opal are caused by
interference of light, not body colour. Opal tends to be fashioned into
Cabochons, but Fire Opals can be faceted.
Opal derives its name from the Sanskrit word Upala, which means precious
stone.
Opal is the birthstone for October.
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