Member of the mica group of minerals. It is the most abundant lithium-bearing mineral and a secondary source of this metal.
It is also a major source of the rare alkali metals rubidium and caesium. It was this that led to the discovery of the new element rubidium in 1861.
Notable occurrences include: Brazil; Ural Mountains; Russia; California USA; Canada; and Madagascar.
It is associated with other lithium-bearing minerals like spodumene in pegmatite bodies.
Crystal system: Monoclinic
Hardness: 2 ½ – 3 ½
Color: Pink, light purple, lavender, light rose red, grey
Luster: Sub-vitreous, resinous, greasy
It can be polished but because of how soft it is, it makes a poor material for jewelry there than pins and pendants.
Himalaya Mine- San Diego County
Yellow variety- Jequintinhonha valley
Little 3 Mine- Ramona district
San Diego County, USA