Orthoclase polished pebble - Madagascar - polished stones 7.3 cm / 187g / AX305

ORTHOCLASE belongs to the silicate group, subgroup of tectosilicates. Its chemical composition is KAlSi3O8.

Inspired by the ability of Orthoclase to cleave along two orthogonal planes, its name was found by the mineralogist Johann August Friedrich Breithaupt who gave it to it in 1823 and comes from the Greek orthos: "straight". Orthoclase is a very common potassium feldspar with the same chemical formula as Microcline (Amazonite) which, however, has multiple twins.

Its color varies from white to gray, yellow, pinkish red, green, pink and can even be colorless. Its density is greater than 2.55 (1 for water) and its hardness is greater than 6/10. The color of the line on the porcelain is white. ORTHOCLASE can be polished into free form, pebbles or tumbled stones.