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Natromontebrasite

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Colour:White, yellowish, pink, ...Lustre:Vitreous
Hardness:5½ - 6
A Mixture Of:Amblygonite, Lacroixite, Wardite


Originally reported from Eight Mile Park, Eight Mile Park pegmatite District, Fremont Co., Colorado, USA.

Classification of Natromontebrasite

IMA status:Discredited 2007
Explanation of status:Species and name natromontebrasite are discredited because natromontebrasite is a mixture of OH-rich amblygonite with lacroixite and subordinate wardite (IMA No. 05-E ).
Dana 8th edition ID:41.5.8.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
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Physical Properties of Natromontebrasite

Lustre:Vitreous
Colour:White, yellowish, pink, greenish, etc.
Hardness (Mohs):5½ - 6

Other Names for Natromontebrasite

Synonyms:
FremontiteNatramblygonite
Other Languages:
German:Natromontebrasit
Natronamblygonit
Simplified Chinese:叶双晶石
Spanish:Natromontebrasita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Natromontebrasite

Reference List:

- +
Schaller (1911) American Journal of Science: 31: 48 (as Natramblygonite).

Gonnard (1913) Bulletin de la Société française de Minéralogie: 36: 120.

Schaller (1914) Journal of the Washington Academy of Science: 4: 354 (as Fremontite).

Schaller (1916) U.S. geological Survey Bull. 610: 141 (as Fremontite).

Mineralogical Magazine (1916): 17: 350 (as Fremontite).

American Mineralogist (1951): 36: 823-827.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 823.

Fransolet, A.-M., Fontan, F., de Parseval, Ph. (2007): Natromontebrasite, a discredited mineral species. Canadian Mineralogist, 45, 391-396.

Internet Links for Natromontebrasite

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    • Localities for Natromontebrasite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Rwanda
     
    • Western Province
      • Gatumba District
    		Mineralogical Magazine 1963 33 : 613-615; Daltry, V.D.C. and O. von Knorring (1998) Type-Mineralogy of Rwanda with Particular Reference to the Buranga Pegmatite. Geologica Belgica 1:1-9
    UK
     
    • England
      • Cornwall
        • Mount's Bay District
          • Breage
    		No reference listed
    USA
     
    • Colorado
      • Fremont Co.
        • Eight Mile Park pegmatite District
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 826; "Minerals of Colorado, updated & revised", p. 15, by Eckel, Edwin B., 1997
    Minerals of Colorado (1997) E.B. Eckels
    "Minerals of Colorado, updated & revised", p. 15, by Eckel, Edwin B., 1997; Rocks & Min. (2007) 82:237
    • Connecticut
      • Middlesex Co.
        • Portland
          • Collins Hill
            • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
    		Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.
    • Maine
      • Oxford Co.
        • Paris
    		King, V. T. and Foord, E. E., 1994, Mineralogy of Maine, Descriptive Mineralogy, volume 1, Maine Geological Survey, Augusta, Maine, USA, pp. 418 + 88 plates.
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