Smoky Quartz with T opaz 31 FIRST FLOOR EXHIBITS T ennanit e Crystals on Whit e Dr usy Quar tz This specimen from Chihuahua Mexico features dark tennanite crystals scat tered across a white quar tz slab T ennanite is an impor tant copper ore mineral and is named for English c hemist Smithson T ennant 1 7 611 81 5 Gift from Ra ymond M Thompson Engle w ood Colorado Smoky Quar tz with T opaz This specimen is made up of smok y quar tz and yellow to paz Smok y quar tz or cairngorm ranges from pale smok y brown to almost blac k The topaz from T eoflio Brazil is a hard mineral that forms in cer tain igneous and metamor phic en vironments In addition to yellow topaz can be colorless or shades of white blue green brown violet pink and red Gemquality topaz is found in the Pik es P eak region Gift from Ra ymond M Thompson Engle w ood Colorado Malac hit e and Limonit e In this specimen from Bisbee Ariz ona bright green malac hite encrusts massi ve brown limonite Malac hite is copper ore and is valued as an or namental stone and gemstone It tak es its name from the Greek moloc he mallow for its typical grassgreen to emeraldgreen color Limonite is an ore of iron found in shades of yellow brown or blac k It is used in paints and pigments Limonite is named from the Greek leimons meadow Gift from the Geolog y Museum Colorado School of Mines Golden Colorado Whit e Celestit e Crystals with Nativ e Sulfur This group of white celestite crystals and yellow nati ve sulfur crystals are from Agrigento Sicily Celestite sulfur and salts are of ten found together in layered evaporite deposits Gift from Ra ymond M Thompson Engle w ood Colorado Sand Bar it e Roses S andbarite roses or deser t roses are Oklahoma s offcial state roc k Their roselik e appearance is due to naturally grown cluster s of sandy barite crys tals that develop when bariumric h groundw ater mo ves through sandric h roc ks or layer s The roset tes from central Oklahoma inherited their red color from the ancient red sandstones in whic h they grew The sandbarite roses are harder than the roc k they formed in so they are lef t behind when the roc k around them is exposed at Ear th s surface and weather s aw ay The sandbarite roset tes of Oklahoma occur mostly in Garber S andstone whic h w as deposited during the P ermian P eriod about 250 million year s ago The area just east of Norman is par ticularly renowned for its abundant and wellformed specimens Gift from the Oklahoma Geological Surv e y courtesy of K enneth S Johnson Magnetit e in Metamor phosed Limest one This specimen is from the Corn w all iron mine once i n c e n t r a l P e n n s y l v a n i a This mine w as closed at the end of 1 972 af ter 230 year s of continuous opera tion The specimen is an aggreg ate of magnetite crystals iron o xide and a group of crystals of analcite Gift from Bethlehem Steel Corporation through Gilbert L Hole