Howlite

Howlite is a boron-rich mineral that was first described in 1868 by Canadian geologist Henry How, after whom the mineral was named.

It is known for its distinct white or gray color, often featuring dark vein-like patterns caused by impurities, mainly manganese and iron oxides, within the mineral’s crystal structure. It is sometimes called “white turquoise” or “white buffalo stone”.

Howlite crystal formations are rare. Instead, it commonly occurs as bulbous nodules that resemble cauliflower. It is a relatively soft mineral, with a Mohs hardness of 3.5, making it easy to carve and shape. It is also a popular material for making imitation gemstones, such as turquoise, as it readily absorbs dyes.