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Diameter, mm (1mm - 0,039inch)
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  3. Orthoclase

Orthoclase mineral - You can buy these samples

Orthoclase is a variety of potassium feldspar. As a rock-forming mineral, it is included in the composition of granites, syenites, and also in the composition of some gneisses and effusives. Used to make porcelain. Jewelers sometimes use faceted translucent orthoclase specimens in their pieces.

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

Physical properties of Orthoclase

General
Category Silicate mineral
Formula
(repeating unit)		 KAlSi3O8
IMA symbol Or
Strunz classification 9.FA.30
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/m
Identification
Color Colorless, greenish, greyish yellow, white, pink
Crystal habit Can be anhedral or euhedral. Grains are commonly elongate with a tabular appearance.
Twinning Typically displays Carlsbad twinning. Baveno and manebach twins have also been reported in orthoclase.
Cleavage Has perfect cleavage on {001} and good cleavage on {010}. Cleavages intersect at 90°. It can be difficult to see cleavage in thin section due to orthoclase's low relief.
Fracture Uneven
Mohs scale hardness 6 (defining mineral)
Luster Vitreous, pearly on cleavage surfaces
Streak White
Diaphaneity Transparent to translucent
Specific gravity 2.55–2.63
Optical properties Biaxial (-), 2V = 65–75
Refractive index nα = 1.518–1.520
nβ = 1.522–1.524
nγ = 1.522–1.525
Birefringence 0.0050–0.0060
Dispersion Relatively strong
Extinction Parallel to cleavage
Length fast/slow No slow or fast length
Diagnostic features Distinguishable from microcline by a lack in gridiron twinning. Distinguishable from sanidine by a larger 2Vx.
Other characteristics Low negative relief;
Alters to sericite or clay (commonly)
Orthoclase
Code: 1755
Orthoclase
Manifestation "Luck", Khabarovsk Territory, Primorye, RF
56*23*20mm

0.00 $ $51.67

Orthoclase
Code: 2048
Orthoclase
Manifestation "Luck", Khabarovsk Territory, Primorye, RF
56*25*23mm

0.00 $ $51.67

Orthoclase translucent archived
Code: 2401
Orthoclase translucent
Manifestation "Luck", Khabarovsk region, Primorye, RF
34*22*13mm

0.00 $ $54.00

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