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Claus Hedegaard

Photo Gallery of Quartz Group

I collect all images of Quartz here, whether coarse crystalline (Rock crystal, Rose, Smoky, Amethyst, ...) or fine (Agate, Jasper, Chalcedony, ...) as well as the non-Quartz silicon dioxides such as Cristobalite, Opal, Tridymite, Letchatelierite, etc. This is not as much 'Quartz Group' as it is 'silicon dioxide group' - and no, neither Quartz nor any of its friends are silicates, they are oxides.

Agate from Brasil.
Agate, replacing coral from Tampa Bay, Florida, USA:
A pair of Argentinean Condor Agate. Ex coll. David Wilber.
England used to have an active Agate quarry. This specimen is from the Dulcote Quarry, Mendip Hills, Somerset, England, Great Britain.
'Grape Agate' from San Rafael Swell, Utah, USA.
Banded Amethyst from Bochovice, Czech Republic.
25 cm specimen with Hematite 'Eisenrose' crystals and a 10 cm Amethyst found in 2003 in 2680 m elevation, 700 m ENE of Steinmanderls on P.2493, Zillertal, Austria. Ex coll. Alfred Kugler, displayed at Mineralientage München 2003.
Amethyst rose from Iraí, Rio Grande do Sul, Brasil.
Amethyst from Tafelkop, Goboboseb Berge, Omaruru District, Erongo Region, Namibia.
Section of Neolithic (app. 4000-2500 BC) stone axe from Denmark, made from Flint (cryptocrystalline Quartz w/wo Opal) with a decorative pattern. Ex coll. Claus Hedegaard.
Smoky Quartz from Farm Anibib, Omaruru District, Erongo Region, Namibia.
'Faden Quartz' specimen with Chlorite covered thread from Le Courbe, Le Freney d'Oisans, Isere, France. Uncredited display at the Mineralientage MŸnchen 2003.
13 cm matrix specimen of 'FadenQuartz' with Calcite from Faille dite de Chemin, Le Noirey, Maurienne, Savoie, France. Uncredited display at the Mineralientage MŸnchen 2003.
Greyish Quartz crystals from Hardangervidda in Norway. Ex coll. Claus Hedegaard.
ÕHerkimer DiamondsÕ are lustrous Quartz crystals from Herkimer Co. In New York, USA, named for the Revolutionary War General Nicholas Herkimer. The crystals are formed in pockets in a very tough, greyish Dolomite and often contain inclusions of black ÕAnthraxoliteÕ, a poorly characterized hydrocarbon. Ex coll. Claus Hedegaard.
Scepter-Fenster Quartz from Berghof near Gamsberg, Namibia.
Milky Quartz overgrowing Fluorite from Blackdene Mine, Weardale, Durham, England, Great Britain.
Single Quartz crystals from La Falliata Quarry, Carrara, Italy. These are similar to the crystals, the Danish researcher-turned-priest Nicolaus Stenonis (Niels Steensen) investigated in Firenze and used to deduce the 'law of constant interfacial angles', thereby founding descriptive crystallography.
Skeleton Quartz crystals from Säollahn (Hollersbachtal, Austria) with Sombat Suebsaard inserted for scale. Displayed at Mineralientage München 2002.
Japan-law Quartz crystals to 7 cm on 21 cm specimen from Marble Hall, Mpumalanga Province, South Africa. Ex coll. Uli Bahmann, displayed at Mineralientage München 2002.
Rose Quartz crystals from Pitorra Mine, Minas Gerais, Brasil.
Big chunk of massive, pitch-black Smoky Quartz from Gislaved, Sweden.

This page is written and maintaned by Claus Hedegaard