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Howlite

Howlite was named after the Canadian mineralogist H.How, and is a very rare mineral. Howlite is a calcium borosilicate, and synonyms for it are khaulite and silicoboroalcite.

The only occurrence of howlite is in California/USA in the Mohave Desert.

Howlite is monoclinic and appears dull white to ivory in colour, and is often streaked with brown or black veins.

Mineral class of the island silicates
Formula: Ca2(BOOH)5 SiO4 + Fe,Mn

Mohs hardness: 3.0 - 3.5
Density: 2.45 - 2.54
Cleavability: none, uneven, earthy fracture
Stroke colour: white
Transparency: opaque to translucent

Healing properties
Self-reliance, attentiveness, encourages to shape one's own life, promotes conscious control of one's own actions