mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Hardness: 2.5-3.5 (Mohs scale); Color: Pink, lilac, purplish-gray; Luster: Pearly to Vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal (micaceous sheets); Specific Gravity: 2.8-2.9
- Hardness
- 2
- Color
- Pink, lilac, purplish-gray
- Luster
- Pearly to Vitreous
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Physical properties
Hardness: 2.5-3.5 (Mohs scale); Color: Pink, lilac, purplish-gray; Luster: Pearly to Vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal (micaceous sheets); Specific Gravity: 2.8-2.9
Formation & geological history
Forms primarily in granitic pegmatites during late-stage hydrothermal crystallization. It is often found associated with other lithium-bearing minerals like spodumene and tourmaline.
Uses & applications
A major source of lithium used in rechargeable batteries, glass, and ceramics. Also used as a decorative stone, in jewelry (cabochons), and highly valued by mineral collectors for its unique color.
Geological facts
Lepidolite is known as the 'stone of transition' in metaphysical circles. Geologically, it is significant for its high rubidium content, which allows for rubidium-strontium dating to determine the age of the rock.
Field identification & locations
Identify by its distinctive purplish color and micaceous (flakey) structure. It is soft enough to be scratched by a copper penny or a fingernail. Commonly found in Brazil, Canada, Madagascar, and the USA (California/Maine).
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metamorphic
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Mineral
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Mineral/Rock
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