Rutilated Quartz tumbled

Aerinite (Ca4(Al,Fe,Mg)10Si12O35(OH)12CO3·12H2O) is a bluish-purple inosilicate mineral. It crystallizes in the monoclinic system and occurs as fibrous masses and coatings. It has a dark, vitreous luster, a specific gravity of 2.48 and a Mohs hardness of 3. It is a low-temperature hydrothermal phase occurring in zeolite facies alteration of mafic rocks. Associated minerals include prehnite, scolecite and mesolite. Its name comes from a Greek root "aerinos," meaning "atmosphere" or "sky".

With its brown, red, and tan patterns, tumbled polychrome Jasper tumbled is a truly beautiful, but rare stone. The material is found only in Madagascar and it's highly sought by sculptors and carvers due to its ability to cut and carve nicely.

When tumbled, the dolomite rock is smooth and glasslike. Often in shades of red, brown, or orange, they can also be grey or cream. Dolomite rock is found worldwide in sedimentary basins, but particularly Italy and Brazil. It was used as an ornamental embellishment by some Ancient Civilizations and is a collector’s item. Large material is decoratively carved.