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GENERAL48838
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Last modified
8/24/2016 8:26:06 PM
Creation date
11/23/2007 4:36:02 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1999002
IBM Index Class Name
General Documents
Doc Date
4/12/1999
Doc Name
The Mineral Nahcolite
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<br />NAHCOLiTE (Sodium Bicarbonate) <br />http://www.galleries.com/minerals/carbonadnahwliUnahcolithtm <br />Minerals ~ By Name ~ Class ~ By Groupings ~ Search ~ Pro en roes ~ Carbonates <br />A J THE MINERAL NAHCOLITE <br />• Chemistry: NaHC03 ,Sodium Bicarbonate. <br />• Class: Carbonates <br />• Uses: Only as mineral specimens. <br />• Specimens <br />Nahcolite is one of those rare minerals that are named for their chemistry. In this case, straight from its <br />formula: NaHC03. Simply replace the (3) with (-life) and-you get nahcolite! There are similarly named <br />minerals such as cavansite which stands for calcium vanadium silicate; nahpoite for its formula <br />Na2H(P04); nacaphite for being a sodium (lea calcium (Ca) phosphate and the inverse canaphite for <br />calcium (CaJ sodium (Na) phosphate. The HC03 ion in nahcolite's formula is called bicarbonate and is <br />composed of one hydroxide which has taken the place of one of the three oxygens on a normal carbonate <br />ion, C03. NaHC03 is also known chemically as "baking soda". Nahcolite forms large concretionary <br />masses in the oil-shales of the Green River Formation and as an evaporate mineral in non-marine <br />sedimentary deposits. Nahcolite was first discovered as a mineral at Searles Lake, California in 1940 and <br />forms several beds in the lake sediments, some up to two feet thick. Nahcolite can absorb water and <br />specimens should be stored in closed containers. <br />PHYSICAL CHARACTERISTICS: <br />• Color is colorless, white, brown or gray. <br />• Luster is vitreous. <br />• Transparency: Crystals are transparent to translucent. <br />• Crystal System is monoclinic; 2/m. <br />• Crystal Habits include prismatic crystals, but usually massive crusts. <br />• Cleavage: There is a perfect cleavage. <br />• Hardness is 2.5. <br />• Specific Gravity is 2.2 (well below average) <br />• Streak is white. <br />• Associated Minerals include other sedimentary evaporate minerals such as hanksite, gaylussite, <br />analcime, halite, pirssonite, northupite, borax and calcite. <br />• Notable Occurrences include Searles Lake, San Bernardino Couniy and Deep Spring Lake, Inyo <br />County, California and the Green River Formation, Colorado, USA; Egypt and Lake Magadi, Kenya. <br />• Best Field Indicators: Environment of formation, cleavage, density, crystal habit and locality. <br />Minerals ~ By Name ~ By Class ~ By Groupings ~ Search ~ ro ernes ~ Carbonates <br />Convrieht ©1999 by Amethyst Galleries. Inc. <br />Spgeeccialist: ESC <br />vifeimit#: M19990~0.2,~` Confidential?: fv~ <br />Class: (?2It0a~R.Q 4~"' Type/Se .: <br />NO ~1~ mr~ Nr~ih~r~, <br />rpsEe: ~-12-14~y <br />1 of 1 - 4/12/99 3:^.9 <br />
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