Howlite

Howlite is easily identified by its spidery grey and black lines in white stone. Because of its appealing texture and complex presentation, Howlite is often thought of as a attuning stone, helping its holder be more open mined and receptive to new information. The most common form of howlite is irregular nodules, with rarer occurrences of crystals such as found in Nova Scotia by Henry How in the late 1800s. How was a chemist, geologist, and mineralogist. It is usually cut into cabachon shapes such as eggs..

Chemical Formula	Ca2B5SiO9(OH)5
Color	White, gray, black streaks, colorless
Hardness	3.5
Crystal System	Monoclinic
Refractive Index	1.583 Â -Â 1.60
SG	2.5 Â -Â 2.6
Transparency	Opaque with thin transparent sections
Double Refraction	.017
Luster	Subvitreous
Cleavage	1,2 - prismatic
Mineral Class	Borates