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Colour:Usually white, also pale ...Lustre:Sub-Vitreous, Resinous, Waxy, Dull
Hardness:5½ - 6
Member of:Amblygonite Group
Name:Named in 1911 by Waldemar T. Schaller for the chemical composition: Natro- (sodian) and for the mineral's similarity to montebrasite. discredited as a mixture in 2007 by Andre M. Fransolet, F. Fontan, and Ph. de Parseval.
A Mixture Of:Amblygonite, Lacroixite, Wardite

Masses of white mineral

Classification of Natromontebrasite

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

5 : (AB)2(XO4)Zq
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Physical Properties of Natromontebrasite

Lustre:Sub-Vitreous, Resinous, Waxy, Dull
Diaphaneity (Transparency):Translucent
Colour:Usually white, also pale yellow, pink, pale green
Hardness (Mohs):5½ - 6
Perfect on {100}, good on {110}, distinct on {011}, and on {001}, imperfect. (Frequently fine-grained)
Density (measured):3.085 g/cm3

Relationship of Natromontebrasite to other Species

Member of:Amblygonite Group
Other Members of Group:

- +

Other Names for Natromontebrasite

Other Languages:
Simplified Chinese:叶双晶石

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, Waldemar Theodore (1911) American Journal of Science: 31: 48 (as Natramblygonite).
Gonnard (1913) Bulletin de la Société française de Minéralogie: 36: 120.
Schaller, Waldemar T. (1914) Journal of the Washington Academy of Science: 4: 354 (as Fremontite).
Schaller, Waldemar T. (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.
    (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.
    • Fujian Province
      • Nanping Prefecture
        • Yanping District
          • Nanping pegmatite field (Xikeng pegmatite field)
    Yueqing Yang, Yunxiang Ni, Yongquan Guo, Nianming Qiu, Chenghu Chen, Chaofa Cai, Yaping Zhang, Jiabing Liu, and Yuexian Chen (1987): Mineral Deposits 6(3), 10-21
    • 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
    • England
      • Cornwall
        • Mount's Bay District
          • Breage
    No reference listed
    • 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)
    Schooner, Richard. (circa 1985), Untitled manuscript on central Connecticut mineralogy.
    • 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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