White Howlite

This is Calcium Borosilicate Hydrate. In nature the colour is white, then, as it is a porous stone, it is subjected to a dye bath (Pink, Blue) based on stabilised anilines, so that the colour does not escape.
Chemical composition: Ca2B5SiO9(OH)5
Hardness: 3,5
Density: 2,5-2,6 g/cm³
Family:
Origin: California, Zimbabwe, Nova Scotia

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