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Mineralpedia Details for Microcline

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Microcline

Microcline

Formula
KAlSi3O8 
Crystal System
Triclinic 
Crystal Habit
Blocky, Crystalline - Coarse, Prismatic 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
bluish green, green, gray, grayish yellow, yellowish 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
WebMineral
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Mindat
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Microcline from Konso, Sidamo-Borana, Ethiopia

Microcline
            from Konso, Sidamo-Borana, Ethiopia

A bluish green crystal on graphic granite at the base. 

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Microcline from Lake George, Park Co., Colorado, United States

Microcline
            from Lake George, Park Co., Colorado, United States

A single, rich deep amazonite green crystal showing several faces.

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Microcline from Crystal Peak area, Teller Co., Colorado, United States

Microcline
            from Crystal Peak area, Teller Co., Colorado, United States

A good combination specien with amazonite crystals to 1.8cm with 3.3cm smoky Quartz crystals.

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Microcline from Moat Mountain, Conway, Carroll Co., New Hampshire, United States

Microcline
            from Moat Mountain, Conway, Carroll Co., New Hampshire, United States

Good sized blocky white Microcline crystals to 4cm on light blue Albite.

Also: Microcline crystals are 5-10mm with white glossy Albite.

And: Sharp white, almost light or faint green Microcline crystals with tiny 1-3mm Albite crystals at the base and smoky Quartz. This is an old Art Smith specimen with a numbered label matching the number on the specimen. Graphic granite base. Ex Art Smith collection.

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Microcline from Mulvaney farm, St. Lawrence Co., New York, United States

Microcline
            from Mulvaney farm, St. Lawrence Co., New York, United States

A locality specimen featuring a few nice white, glossy Microcline crystals to 2.2cm. 

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Microcline with Baveno twin from Devil's Den, Boise Co., Idaho, United States

Microcline with Baveno twin
            from Devil's Den, Boise Co., Idaho, United States

Single pink Microcline crystal, the dominant potasium feldspar found in granitic pegmatites. This specimen shows a Baveno twin as seen by the "X" pattern on the terminating prism. Collected in 1986 by Chris van Laer.

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Microcline with Baveno twin from Bighorn Crags, Lemhi Co., Idaho, United States

Microcline with Baveno twin
            from Bighorn Crags, Lemhi Co., Idaho, United States

A stark white nice Microcline prism with one end showing the Baveno twin with four faces making an X pattern. Two of the faces are very small. One end is fractured. Collected in 1987 by Lanny Ream and traded to van Laer.

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Microcline with Baveno twin from Cathedral Rock, Ravalli Co., Montana, United States

Microcline with Baveno twin
            from Cathedral Rock, Ravalli Co., Montana, United States

A thick prismatic light tan single crystal terminated on one end and showing good Baveno twinning. 

Also: A nice miniature with three prismatic faint pink to white Microcline crystals. The largest is 3cm with Baveno twinning, Tiny 1-3mm dark smoky Quartz crystals present at the base. The large crystal is repaired. Collected by Lanny Ream in 2002.

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Microcline var. amazonite from Pikes Peak, El Paso Co., Colorado, United States

Microcline var. amazonite
            from Pikes Peak, El Paso Co., Colorado, United States

Large single crystal of the green variety of Microcline called amazonite. The green amazonite color is diagnostic for Microcline. I think there is an exception to this but don't recall the case.

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Microcline from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Microcline
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Greyish white single crystal of Microcline. It shows relatively irregular perthitic intergrowths, grey to white layers. A few dark smioky Quartz crystals are attached. It is terminated on one end and fractured on the other. 

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Microcline var. amazonite from Ten-Percenter mine, Crystal Peak dist., Teller Co., Colorado, United States

Microcline var. amazonite
            from Ten-Percenter mine, Crystal Peak dist., Teller Co., Colorado, United States

Single green Microcline crystal, terminated and associated with a large rosette of Albite.

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