Lepidolite and Microcline

ID	206
Mineral	Lepidolite Microcline
Location	Skuleboda - Vane Ryr - Vastra Gotaland - Sweden
Fluorescence	LW-UV: close SW-UV: close
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ID	2380
Long ID	1:1:2380:7
IMA Status	0
Entry type	4
Description	A Li-rich mica in, or close to, the so-called Polylithionite-Trilithionite series. Compare also fluorluanshiweiite and luanshiweiite. The original lepidolite came from Rožná pegmatite, Žďár nad Sázavou, Vysočina Region, Moravia (Mähren; Maehren), C...
Occurrence	Granite pegmatite
Other Occurrences	May be found in aplites associated with granite pegmatite. rarely found in hydrothermal veins and extremely rarely in granite contact zones.
Industrial	Ore of lithium, cesium, and rubidium.
Diapheny	Transparent,Translucent
Cleavage	{001} perfect
Tenacity	elastic
Colour	Pink, light purple, light rose red, other colors possible but are rare.
Hardness (min)	2.5
Hardness (max)	3.5
About the name	Named in 1792 by Martin Klaproth from the Greek words lepidos for "scale" and lithos for "stone".
Streak	white
Crystal System	Monoclinic
Cleavage Type	Perfect
Fracture type	Micaceous
UV	Frequently fluoresces medium intensity of creamy white to pale yellow. Sometimes yellow.
shortcode_ima	Lpd
Group	Trioctahedral mica

ID	2704
Long ID	1:1:2704:1
Formula	`K(AlSi₃O₈)`
IMA Status	0 1
Other Occurrences	Plutonic felsic rocks, pegmatites, high-grade metamorphic veins, hydrothermal veins
Industrial	Ceramics
Discovery Year	1830
Diapheny	Transparent,Translucent
Cleavage	on [001], good on [010]
Tenacity	brittle
Colour	White, grey, greyish yellow, yellowish, tan, salmon-pink, bluish green, green.
Hardness (min)	6.0
Hardness (max)	6.5
Luminescence	None
Lustre	Vitreous
About the name	Name given in 1830 by Johann Friedrich August Breithaupt to a reddish to brownish feldspar from Arendal, Norway, and a feldspar with bluish schiller from Stavern (formerly Fredrichsvärn), Norway, from the Greek μικρός (little) and κλινειν (to incline), in allusion to the small departure from monoclinic symmetry.
Streak	White
Crystal System	Triclinic
Cleavage Type	Perfect
Fracture type	Irregular/Uneven
Morphology	Prismatic crystals (to 50 m and 13,500 t), granular, massive. Commonly forms perthitic intergrowths.
Twinning	Carlsbad, Baveno, Manebach, polysynthetic on albite and pericline laws.
Comment Luster	Pearly on cleavage
shortcode_ima	Mcc

Price: € 5

Dimensions: Not registered

Weight: Not registered

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