Howlite is a relatively white black hued gemstone that is white with occasional streaks of greyish-black on its surface. It is made of the borate mineral calcium borosilicate hydroxide. It is a semi-porous stone that comes in a variety of color tones. It is a lovely stone that symbolises supernal and conscious existence. The Canadian mineralogist Henry How is the source of the name “howlite,” which refers to the stone’s official discovery in the 18th century.