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  • Mineral Type - Quartz - Amethyst

Mineral Type - Quartz - Amethyst

A variety of Quartz

A violet to purple variety of quartz that owes its color to gamma irradiation (Berthelot, 1906) and the presence of traces of iron built into its crystal lattice (Holden, 1925). The irradiation causes the iron Fe(+3) atoms that replace Si in the lattice to lose an electron and form a [FeO4]0 color center (Lehmann and Moore, 1966).
The color in amethyst from most localities is unevenly distributed in the individual crystals. In amethyst geodes it is often most intense in the growth zones under the rhombohedral faces (at the tips). Occasionally the color is deeper under either the r or z rhombohedral faces, giving the crystal a pinwheel appearence when viewed from the top. In prismatic crystals the color may appear in phantom-like thin layers, while in scepters and skeleton quartz the color is often concentrated along the edges, and accompanied by smoky zones. Despite the intense color, the content of iron occupying Si positions in amethyst is rather low, in the 10-100 ppm range (Dennen and Puckett, 1972).

Name

From Greek "a-methystos", meaning not drunk.

Physical Properties

Lustre: Vitreous
Colour: Violet – purple. Pleachroic: Blue – violet to purple

Chemical Properties

Formula: SiO2
Elements listed: O, Si

Synonyms

Amethystine agate, Amethystine quartz, Bishops Stone and Lavendine

Varieties

Burnt amethyst, and Hair Amethyst

Natural Extra Large Spirit Amethyst Quartz Crystal Cluster x 1 From Boekenhouthoek, South Africa

Natural Extra Large Spirit Amethyst Quartz Crystal Cluster x 1 From Boekenhouthoek, South Africa

R 1,612.00 ZAR
Natural Medium Amethyst Quartz Crystals x 4 From Ambatondrazaka, Madagascar

Natural Medium Amethyst Quartz Crystals x 4 From Ambatondrazaka, Madagascar

R 522.00 ZAR
Natural Medium Multi & Double Terminated Amethyst Quartz Crystals x 4 From Ambatondrazaka, Madagascar

Natural Medium Multi & Double Terminated Amethyst Quartz Crystals x 4 From Ambatondrazaka, Madagascar

R 578.00 ZAR
Polished Extra Extra Large Rare Size Good Purple Amethyst Quartz Crystal x 1 From Madagascar

Polished Extra Extra Large Rare Size Good Purple Amethyst Quartz Crystal x 1 From Madagascar

R 12,853.00 ZAR
Natural Medium Spirit Amethyst Quartz Crystal Clusters x 2 From Boekenhouthoek, South Africa

Natural Medium Spirit Amethyst Quartz Crystal Clusters x 2 From Boekenhouthoek, South Africa

R 1,302.00 ZAR
Natural Medium Window Quartz, Double Terminated & Sceptre Amethyst Quartz Crystals x 4 From Ambatondrazaka, Madagascar

Natural Medium Window Quartz, Double Terminated & Sceptre Amethyst Quartz Crystals x 4 From Ambatondrazaka, Madagascar

R 812.00 ZAR
Polished Amethyst & Quartz Crystalline Centred Agate Geodes x 3 From Mainterano, Madagascar

Polished Amethyst & Quartz Crystalline Centred Agate Geodes x 3 From Mainterano, Madagascar

R 491.00 ZAR
Polished Medium Amethyst Quartz Crystals x 6 From Zambia

Polished Medium Amethyst Quartz Crystals x 6 From Zambia

R 742.00 ZAR
Natural Extra Extra Large Amethyst Hematoid Quartz Cluster x 1 From Zambia

Natural Extra Extra Large Amethyst Hematoid Quartz Cluster x 1 From Zambia

R 2,552.00 ZAR
Natural Polished Tops Amethyst Quartz Crystal Points x 6 From Zambia

Natural Polished Tops Amethyst Quartz Crystal Points x 6 From Zambia

R 835.00 ZAR
Natural Window & Double Terminated Amethyst Quartz Crystals x 6 From Ambatondrazaka, Madagascar

Natural Window & Double Terminated Amethyst Quartz Crystals x 6 From Ambatondrazaka, Madagascar

R 824.00 ZAR
Polished Large Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Large Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 1,159.00 ZAR
Polished  Large Chevron Amethyst Quartz Crystal Ball x 1 From Zambia

Polished Large Chevron Amethyst Quartz Crystal Ball x 1 From Zambia

R 977.00 ZAR
Polished  Amethyst Crystals with natural Sides and cut bases - sold per piece From Zambia

Polished Amethyst Crystals with natural Sides and cut bases - sold per piece From Zambia

R 140.00 ZAR
Polished Large Chevron Amethyst Quartz Crystal Points x 3 From Zambia

Polished Large Chevron Amethyst Quartz Crystal Points x 3 From Zambia

R 1,044.00 ZAR
Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 877.00 ZAR
Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 971.00 ZAR
Polished Small Chevron Amethyst Quartz Crystal Points x 12 From Zambia

Polished Small Chevron Amethyst Quartz Crystal Points x 12 From Zambia

R 1,245.00 ZAR
Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 992.00 ZAR
Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 929.00 ZAR
Polished Small to Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Small to Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 1,138.00 ZAR
Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 998.00 ZAR
Polished Small to Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Small to Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 929.00 ZAR
Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 1,206.00 ZAR
Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 908.00 ZAR
Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 1,002.00 ZAR
Polished Small to Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Small to Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 1,096.00 ZAR
Polished Small to Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Small to Medium Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 1,054.00 ZAR
Polished Small Chevron Amethyst Quartz Crystal Points x 6 From Zambia

Polished Small Chevron Amethyst Quartz Crystal Points x 6 From Zambia

R 825.00 ZAR
Polished Small to Medium Chevron Amethyst Quartz Crystals x 6 From Zambia

Polished Small to Medium Chevron Amethyst Quartz Crystals x 6 From Zambia

R 1,054.00 ZAR
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