Madeira Quartz Crystals

Madeira quartz is a trade name for heated amethyst with a richer yellow to yellow-orange colour.  The vast majority of commercial grade citrine is heated amethyst. 

Natural citrine is quite rare so can also be expensive.

When amethyst is heated to more than 500°C (932°F) it changes colour.  For this reason is has long been used to imitate citrine. 

The name Madeira quartz which has only appeared fairly recently may have been introduced as an alternative to "citrine".

These highly polished quartz crystals have a vitreous lustre which means the surface of the stone reflects light in a similar way to glass.  Some exhibit subtle iridescence and they're mostly translucent.

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