Info: Anhydrite is calcium sulfate. Often is found in whole, grain-like or fibre agregates, which can be found very often in large numbers. Anhydrite is usually greyish, but it can be reddish sometimes. The most priced are the rare purpule anhydrites. The mineral is translucent to transparent...
Info: The most common forms of thenardite is crust-like or flower-like, but it can be found also in the forms of big bypyramidal crystals. The twins of this crystal often grow in the form of cross. Thenardite is often colourless, but it can be also greyish, yellowish or reddish colouration....
