Is a rare mineral with formula Ca6Al2(SO4)3(OH)12 - 26H2O , a Hydrated Calcium Aluminium Sulphate Hydroxide. The hardness is very low: 2-2.5 as well the specific gravity :1.7, much below the average .
It forms as a precipitate from hydrothermal solutions and is difficult to distinguish from Sturmanite. It is found on N’Chawning II Mine,Northern Cape, South Africa.
Always included with small growing planes. The color is a bright lemon yellow. A gem for collectors!
Size: 8.5x8.5x6 mm.
Weight: 1.31 ct.