Quartz

Quartz is a hard, crystalline mineral composed of silicon and oxygen atoms. The chemical formula is SiO2.May occur either in well-formed crystals, sometimes enormous and weighing up to 130 kg ( 289 lb), or in compact and concretionary masses, microcrystalline (quartzites) to cryptocrystalline ( agates, jaspers, carnelian, etc.). Colorless when pure (rock crystal). The presence of impurities may give a whole range of colors. Quartz crystals are usually hexagonal and prismatic. Quartz is one of the commonest minerals of the earth's crust. It occurs in plutonic rocks ( granites, granodiorites, tonalites) and in hypabyssal ( granite, porphyries, pegmatites, ect.) and volcanic rocks (quartz porphyry, rhyolites)Stable in sedimentary conditions either either as detrital mineral ( alluvial, marine and desert sands).Quartz is so common that it is impossible to list all the places where it is found.Rock Cystal occurs mainly in pegmatites, Alpine fissures and geodes. Famous localities include Minas Gerais ( Brazil), Val Cristillina in St. Gotthard region, Italy ( Dosso dei Cristalli, Val Malenco, Sondrio, Val d'Aosta, Alto Adige), Austria, France and Japan. Carrara marble from Italy contains unusually clear crystals. Small, perfect rock crystals are sometimes found in cavities in dolomitic rock (Selvino, Bergamo, Italy, Herkimer County NY USA). Collectors of crystals used to believe that transparent, colorless rock crystal war petrified ice. A very important mineral in industry because of its piezoelectric properties, its ability to rotate the plane of polarization of light and its transparency I ultraviolet rays (heat-ray lamps, prisms and lenses)

Faden Quarzt 5X2X3 cm 0,015 kg

Faden Quarzt 5X2X3 cm 0,015 kg

5,00 €

Quartz Crystal    8,5X5X3 cm 0,180 kg

Quartz Crystal 8,5X5X3 cm 0,180 kg

50,00 €

Quartz Crystal    8X4X5 cm 0,205 kg

Quartz Crystal 8X4X5 cm 0,205 kg

52,00 €

Quartz Crystal    9X7,5X4,5 cm 0,130 kg

Quartz Crystal 9X7,5X4,5 cm 0,130 kg

37,00 €

Quartz Crystal | 5 x 3,5 x 7 cm, 0,144 kg

Quartz Crystal

5 x 3,5 x 7 cm, 0,144 kg

34,00 €

Quartz Crystal | 7,5 x 6 x 5 cm, 0,214 kg

Quartz Crystal

7,5 x 6 x 5 cm, 0,214 kg

47,00 €

Quartz Druse | 13 x 7,2 x 2,5 cm, 0,308 kg

Quartz Druse

13 x 7,2 x 2,5 cm, 0,308 kg

35,00 €

Quartz Druse | 4,5 - 6 cm

Quartz Druse

4,5 - 6 cm

9,00 €

Quartz Druse | 5-7 cm

Quartz Druse

5-7 cm

11,00 €

Quartz Druse | 6,5 x 5,5 x 3,5 cm, 0,140 kg

Quartz Druse

6,5 x 5,5 x 3,5 cm, 0,140 kg

14,00 €

Quartz Druse | 6-7 cm

Quartz Druse

6-7 cm

13,00 €

Quartz Druse | 7 x 4,5 x 3 cm, 0,115 kg

Quartz Druse

7 x 4,5 x 3 cm, 0,115 kg

12,00 €

Quartz Druse | 7 x 5 x 3,5 cm, 0,112 kg

Quartz Druse

7 x 5 x 3,5 cm, 0,112 kg

12,00 €

Quartz Druse | 7,5 x 5,8 x 2,5 cm, 0,136 kg

Quartz Druse

7,5 x 5,8 x 2,5 cm, 0,136 kg

15,00 €

Quartz Druse | 7-7,5 cm

Quartz Druse

7-7,5 cm

22,00 €

Quartz Druse | 8 x 4,5 x 3 cm, 0,100 kg

Quartz Druse

8 x 4,5 x 3 cm, 0,100 kg

12,00 €

Quartz Druse | 9,5 x 6 x 3 cm, 0,250 kg

Quartz Druse

9,5 x 6 x 3 cm, 0,250 kg

25,00 €