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  2. Collectible minerals
  3. Microcline

Collectible minerals - full range in stock "Microcline"

Microcline is a rock-forming mineral, a variety of potassium feldspar. Widely distributed in nature. In the microcline one can usually see perthites - white ingrowths of another feldspar - albite.
You can see microcline stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Microcline

General
Category Tektosilicate
Formula
(repeating unit)		 KAlSi3O8
IMA symbol Mcc
Space group P1 (no. 2)
Identification
Color White, grey, greyish yellow, yellowish, tan, salmon-pink, bluish green, green.
Crystal habit Can be anhedral or euhedral. Grains are commonly elongate with a tabular appearance. May contain lamellae which formed from exsolved albite.
Twinning Typically displays albite twinning and pericline twinning. This combination leads to a grid pattern, hence microcline displays gridiron twinning. Can also display carlsbad twinning, simple twins, or lack twinning altogether. Lamellae in microcline are discontinuous and "pinch and swell."
Photomicrograph of thin section of microcline showing crosshatched crystal twinning (in cross polarized light)
Cleavage Has perfect cleavage parallel to {001} and good cleavage on {010}. Cleavages intersect at 90°41'. It can be difficult to see cleavage in thin section due to microcline's low relief.
Fracture Uneven
Tenacity Brittle
Mohs scale hardness 6-6.5
Luster Vitreous
Streak White
Diaphaneity Transparent, translucent
Specific gravity 2.5-2.6
Optical properties Biaxial negative
Refractive index nα = 1.514 - 1.529 nβ = 1.518 - 1.533 nγ = 1.521 - 1.539
Birefringence Up to first order white (roughly 0.007)
Pleochroism N/A
2V angle 65–88°
Extinction Inclined extinction to cleavage
Diagnostic features Gridiron twinning distinguishes microcline from other feldspars. Distinguishable from plagioclase because the lamellae in plagioclase are continuous and do not "pinch and swell."
Alters to Commonly alters to sericite or clay.
Relief Low negative relief
Optical sign Biaxial negative
Color in PPL Colorless
Mn-Ilmenite archived
Code: 3784
Mn-Ilmenite
Marchenko Peak, Khibiny, Kola Peninsula, RF
49*31*29mm

0.00 $ $18.33

Microcline (twin) archived
Code: 3084
Microcline (twin)
Lovozersky massif, Kola Peninsula, RF
42*37*28mm

0.00 $ $132.00

Eudialyte (crystal), Microcline archived
Code: 2711
Eudialyte (crystal), Microcline
Northern quarry, Mount Alluive, Lovozersky massif, Kola Peninsula, RF
28*25*23mm

0.00 $ $11.00

Mn-Ilmenite archived
Code: 944
Mn-Ilmenite
Marchenko Peak, Khibiny, Kola Peninsula, RF
46*39*19mm

0.00 $ $22.00

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