BLM

Arizona Strip Field Office Americans BLM Lands Benefit Benefit Lands BLM economic growth and economic growth areas sustainability in such as recreation, and ranching, forest woodland products, mining, and energy development. BLM valuable, lands provide tangible goods that surrounding on communities rely and use every day to heat homes, build and and maintain roads, feed families. Please help the BLM with its mission to sustain the health, and diversity, of the productivity public lands for the use and enjoyment and future of present generations. The BLM strives to The BLM neighbor be a good communities within its land by balancing conservation with multiple use. The BLM provides local opportunities for form? Map at time of deposition 250 million years ago (Paleogeography of Southwest North America ©2012 Colorado Plateau Geosystems Inc.) How does Gypsum does Gypsum How southern portion of of Utah and this area northern Arizona. gypsum, and halite (table salt). An example of this type is the of environment Lake. Salt Great This selenite was deposited as part of the Moenkopi Formation during the about 250 early Triassic million years ago for several million years. At this time, a large basin existed over the evaporative evaporative as such environments, In closed-basin lakes. these lakes, a water terminates source in the lake basin. Dissolved ions within the water concentrate in the basin. As the water evaporates, minerals precipitate out of the water and form solid salts, including calcite, Gypsum is commonly Gypsum highly formed in

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2 Fingernail Knife / Glass Copper Coin ·2H 4 What is Selenite? is Selenite? What Mohs Hardness Scale www.thegemchronicles.com fingernail and will not be scratched. are harder than your harder are such as quartz and varieties of mica, your fingernail. Other minerals, transparent Scale (see below), which is softer than Gypsum has a hardness Gypsum has a hardness of 2 on Mohs Hardness it with your fingernail. If you find a clear If you find a clear mineral, try scratching characteristic of gypsum is its hardness. In fact, the most important identifying All varieties of gypsum All varieties of gypsum very soft minerals. are called “selenite” called “selenite” (CaSO transparent, crystalline crystalline transparent, form of gypsum This mine contains This mine of a a deposit