SELENITE MINERAL GYPSUM INFORMATION PICTURES COMPLETE INFORMATION GUIDE GEMSTONES LOADING MINERALS VARIETIES VIEW BY ALPHABETICAL ORDER NAMES SEARCH FILTER CHEMICAL GROUP COLOR FILTER STREAK HARDNESS CRYSTAL GROUP MOST QUARTZ DIAMOND PYRITE GOLD FLUORITE AMETHYST CALCITE GALENA TALC GEMSTONE BIRTHSTONE GARNET COLOR WHITE BLUE RED GREEN YELLOW ORANGE PINK PURPLE BANDED MULTICOLORED RUBY SAPPHIRE TOPAZ AGATE TOURMALINE JASPER ZIRCON EMERALD RESEARCH ROCK PROPERTIES SPECIFIC GRAVITY LUSTER FRACTURE TENACITY CHEMICAL PROPERTIES BIRTHSTONES TOP 5 TIPS BUYING TOPICS QUESTIONS QUESTION POPULAR NEWS BLOG NEWSLETTER TWITTER NEWS FEED FOLLOW US PINTEREST GLOSSARY PHOTO GALLERY YOUTUBE CHANNEL DIRECTORY YOUR FREE LISTING ONLINE REFERENCE PUBLICATIONS MUSEUMS BLOGS SHOW ADVERTISING INTERESTING UNIQUE CRYSTALS INTACT DISTORTIONS PARTS BROKEN CLAY BEDS FLOATER FULLY ATTACHED SLIM BEND GOOD BIT TOO MUCH CHEMICAL COMPOSITION ANHYDRITE WATER STRUCTURE THE MORE COMMON EVIDENCE LAYERS TESTIFY EXPANSION ADDITION SMALL NUMBER GETS TRAPPED INSIDE HOLLOW CHANNEL THE CRYSTAL BUBBLE MOVES TOWARD LOWEST POINT MINERALOGICAL ODDITY SOMETIMES SANDY TRAP SAND CAUSING SPECIMEN BROWN GRAY HOURGLASS PRESENT DESERT ROSE ROSETTE TERM BARITE SHOULD ENTER CRACKS CHEMICAL FORMULA CASO4 2H2O COMPOSITION HYDROUS CALCIUM SULFATE LIGHT GREEN CRYSTAL SYSTEM MONOCLINIC ANIMATED TABULAR SOMETIME PERFECT DENSE FRAGILE ACICULAR CRYSTALS FIBROUS MASSES FORMING RAMS TWINS SWALLOWTAIL IN FACT LARGEST EVER EARTH TRANSPARENCY OPAQUE CLEAVAGE MICACEOUS UNEVEN SECTILE MARKS FLUORESCENT LIGHT YELLOW SHORTWAVE ULTRAVIOLET LIGHT IN GROUP FEATURES SECTILITY ENVIRONMENT DEPOSITS SEDIMENTARY ROCK SEDIMENTARY DEPOSITS IGNEOUS OXIDATION ZONE SULFIDE ROCK TYPE SEDIMENTARY POPULARITY PREVALENCE DEMAND EBAY ALABASTER FINE GRAINED VARIETY REFER TO TYPE ARAGONITE TRAVERTINE GYPSUM FLOWER CAVERNS IMPURITIES LIMONITE