Treated Citrine from Minas Gerais, Brazil

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Citrine is probably one of the most talked about minerals going around. Is it natural, is it heat treated and does it matter!?

From an aesthetic point of view, the golden points on a citrine cluster can look amazing and from a chemical formula point of view, it is still a variety of quartz (SiO2).

The earth naturally creates citrine with geo-thermal heat source; from within the mantle by heating amethyst or smoky quartz which gives it the lovely golden colour. When a piece of dull amethyst or smoky quartz is heat treated, it is mimicking the process that occurs naturally, natural citrine is a much lighter hue.

It is sometimes hard to tell if a specimen has been heat treated, like with the heat treated specimen you see here, the colour will be most concentrated at the tips but white at the base.  Heat treated citrine can be kind of crumbly and break apart easily since heating the specimens at the temperature necessary does seem to weaken the stability of the crystals. I have quite a few specimens of natural Australian citrine from Torrington in the collection, check out that page to see the difference in colour.

A classic locality for natural Citrine that is already exhausted is Olkhovka in the Northern Ural Mountains of Russia. Most of the citrine that comes from Brazil will be heat treated amethyst.

I acquired this specimen back in 2008 from GEO Discoveries, a mineral and fossil shop located in West Gosford on the NSW Central Coast.

Specimen Details

Chemical Formula: SiO2

ID #: JG0036

Colour: Dark yellow/golden, orange

Hardness: 7

Acquisition Date: 04/06/2008

Crystal System: Hexagonal

Lustre: Vitreous

Dimensions: 130mm x 88mm x 37mm

Weight: 415g

Location: Unknown locality for this specimen. If I were to have a guess as to where this specimen came from, I would say Minas Gerais, Brazil.

Rarity of Mineral

Very Common

Did you know!?
After Amethyst, Citrine is the most popular Quartz gem. Due to its hardness, it is faceted for jewellery, and it is often used as an inexpensive substitute for Topaz.

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