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  3. Topaz

Collectible minerals - full range in stock "Topaz"

Topaz is a semi-precious mineral on the Mohs hardness scale with a hardness value of 8. It can form large crystals. Common for greisens and granitic pegmatites. In Russia, topazs, which were called "heavyweights", have been known since the 17th century.

You can see topaz stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Topaz

General
Category Nesosilicate minerals
Formula
(repeating unit)		 Al2SiO4(F,OH)2
IMA symbol Tpz
Strunz classification 9.AF.35
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Pbnm
Unit cell a = 4.65 Å, b = 8.8 Å,
c = 8.4 Å; Z = 4
Identification
Color Colorless (if there are no impurities), white, blue, brown, orange, gray, yellow, yellowish brown, green, pink, reddish pink or even red
Crystal habit Prismatic crystal
Twinning Rarely on [111]
Cleavage [001] Perfect
Fracture Subconchoidal to uneven
Mohs scale hardness 8 (defining mineral)
Luster Vitreous
Streak White
Diaphaneity Transparent
Specific gravity 3.49–3.57
Optical properties Biaxial (+)
Refractive index nα = 1.606–1.629
nβ = 1.609–1.631
nγ = 1.616–1.638
Birefringence δ = 0.010
Pleochroism Weak in thick sections X = yellow; Y = yellow, violet, reddish; Z = violet, bluish, yellow, pink
Ultraviolet fluorescence Short UV=golden yellow; Long UV=cream

Topaz
Code: 3960
Topaz
Nura-Taldy, Kazakhstan
43*41*22mm

0.00 $ $48.33

Topaz
Code: 3961
Topaz
Nura-Taldy, Kazakhstan
45*42*22mm

0.00 $ $35.00

Topaz
Code: 3962
Topaz
Nura-Taldy, Kazakhstan
29*18*20mm

0.00 $ $35.00

Topaz
Code: 3963
Topaz
Nura-Taldy, Kazakhstan
39*29*16mm

0.00 $ $35.00

Topaz
Code: 2786
Topaz
Field "Forgotten", Primorye, RF
22*20*15mm

0.00 $ $48.33

Topaz polychrome
Code: 2789
Topaz polychrome
settlement Volodarsk-Volynsky, Zhytomyr region, Ukraine
34*32*7mm

0.00 $ $32.00

Topaz archived
Code: 2787
Topaz
Field "Forgotten", Primorye, RF
22*16*16mm

0.00 $ $28.00

Topaz archived
Code: 2788
Topaz
Field "Forgotten", Primorye, RF
20*14*12mm

0.00 $ $28.00

Topaz polychrome archived
Code: 2790
Topaz polychrome
settlement Volodarsk-Volynsky, Zhytomyr region, Ukraine
38*35*7mm

0.00 $ $24.00

Topaz archived
Code: 2426
Topaz
settlement Volodarsk-Volynsky, Zhytomyr region, Ukraine
45*24*10mm

0.00 $ $25.00

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