Quantcast

Latest Selenite Stories

2011-01-12 16:38:44

Scientists are reporting a scientific basis for the long-standing belief that a widely used non-prescription drug in China and certain other countries can prevent and treat cataracts, a clouding of the lens of the eye that is a leading cause of vision loss worldwide.


Latest Selenite Reference Libraries

28_1edea1726841016f6cad5f55677d5af7
2005-05-26 10:48:13

Gypsum is a very soft mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. Chemical structure Heating gypsum above approximately 150°C (302°F) partially dehydrates the mineral by driving off exactly 75% of the water contained in its chemical structure. CaSO4·2H2O + heat → CaSO4·½H2O + 1½H2O (steam) The partially dehydrated mineral is called calcium sulfate hemihydrate or calcined gypsum (commonly known as plaster of...

28_65c12c42e9ce0997ce045dbd554638ce
2005-05-25 18:13:45

Selenite (chemical formula: CaSO4·2H2O) is a hydrous calcium sulfate, meaning it is composed of oxygen, sulfur, hydrogen, calcium and water. It is basically a glassy, well-crystallized form of gypsum and is often referred to as satin spar. Selenite is soft, and can easily be scratched with a fingernail. The thin crystals can be slightly flexible, but will snap if bent too far. Some crystals found in Kentucky have grown in severely curved patterns and flower-like petals. In some very...

More Articles (2 articles) »
Word of the Day
saggar
  • A ceramic container used inside a fuel-fired kiln to protect pots from the flame.
The word 'saggar' may come from 'safeguard'.
Related