Quick Facts on Howlite Stones
| Chemical Structure |
: | Ca2B5SiO9(OH)5 |
| Mineral |
: | Calcium Boro-Silicate Hydroxide |
| Color |
: | Varies from green to blue |
| Hardness |
: | 3.5 |
| Specific Gravity |
: | 2.5 to 2.6 |

Howlite
mineral stones have obtained this name form their discoverer Henry
How, a renowned geologist. These minerals are famous as these can
frequently imitate other minerals. Howlite stones are available
either in white or gray color. These can easily be dyed and be dyed
a turquoise blue. Color of these gemstones varies from white to gray
mottles, blotches and web-like markings. The luster of these stones
may either be dull, or semi-glassy or earthy. The crystals of these
stones are either translucent or opaque and the crystalline system
is Monoclinic. No cleavages are found on the stone surface.