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About GrumantiteHide

Na(HSi2O5) · H2O
4 - 5
Specific Gravity:
Crystal System:
From an old Russian name for the Spitzbergen Archipelago.
This page provides mineralogical data about Grumantite.

Classification of GrumantiteHide

Approval Year:

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units

78 : Unclassified Silicates
4 :

14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals

Physical Properties of GrumantiteHide

4 - 5 on Mohs scale
Hardness Data:
on {100}
2.21 g/cm3 (Measured)    2.26 g/cm3 (Calculated)

Optical Data of GrumantiteHide

Biaxial (+)
RI values:
nα = 1.494 nβ = 1.507 nγ = 1.523
Measured: 83° to 87°, Calculated: 84°
Max Birefringence:
δ = 0.029
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of GrumantiteHide

Na(HSi2O5) · H2O
IMA Formula:
NaSi2O4(OH) · H2O

Crystallography of GrumantiteHide

Crystal System:
Class (H-M):
mm2 - Pyramidal
Space Group:
Cell Parameters:
a = 15.979 Å, b = 18.25 Å, c = 7.169 Å
a:b:c = 0.876 : 1 : 0.393
Unit Cell V:
2,090.60 ų (Calculated from Unit Cell)

Type Occurrence of GrumantiteHide

General Appearance of Type Material:
irregular crystals, compact massive
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Russia; Mineralogical Museum, St. Petersberg, Russia; A.E.Fersman Mineralogical Museum, Moscow, Russia
Geological Setting of Type Material:
in veins cutting alkalic feldspathoid-bearing pegmatites in a differentiated alkalic massif

Synonyms of GrumantiteHide

Other Language Names for GrumantiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aegirine2 photos of Grumantite associated with Aegirine on mindat.org.
Kazakovite2 photos of Grumantite associated with Kazakovite on mindat.org.
Ussingite2 photos of Grumantite associated with Ussingite on mindat.org.
Sodalite1 photo of Grumantite associated with Sodalite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EH.05NeptuniteNa2KLiFe2+2Ti2Si8O24Mon. m : Bb
9.EH.05MagnesioneptuniteKNa2Li(Mg,Fe)2Ti2Si8O24Mon. 2/m : B2/b
9.EH.20UssingiteNa2AlSi3O8OHTric. 1 : P1
9.EH.25Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2Trig. 3m : P3m1
9.EH.25Telyushenkoite(Cs,Na,K)Na6[F2|Be2Al3Si15O39]Trig. 3m (3 2/m) : P3 1m
9.EH.25EirikiteKNa6Be2(Si15Al3)O39F2Trig. 3m (3 2/m) : P3m1
9.EH.30NafertisiteNa3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2Mon. 2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.1.3RevditeNa16Si16O27(OH)26 · 28H2OMon. 2 : B2
14.1.4MakatiteNa2Si4O8(OH)2 · 4H2OMon. 2/m : P21/b
14.1.5MagadiiteNa2Si14O29 · 11H2OMon.
14.1.6KenyaiteNa2Si22O41(OH)8 · 6H2OMon.
14.1.8SilinaiteNaLiSi2O5 · 2H2OMon. 2/m

Other InformationHide

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

References for GrumantiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Khomyakov, A.P., Korobitsyn, M.F., Kurova, T.A., Cherepivskaya, G.E. (1987) Grumantite NaHSi2O5·H2O—a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva: 116(2): 244-248.
Jambor, J.L., Grew, E.S., Puziewics, J., Vanko, D.A. (1988) New mineral names. American Mineralogist: 73: 439-445.
Pushcharovsky, D.Y., Nadezhina, T.N., Yamnova, N.A., Rastsvetaieva, R.K. (1988) New types of tetrahedral radicals in mineral structures: Be(OH)2 and grumantite. Zeitschrift für Kristallographie: 185: 612.
Yamnova, N.Y., Pushcharovskii, D.Y., Andrianov, V.I., Rastsvetaeva, R.K., Khomyakov, A.P., Mikheeva, M.G. (1989) A new type of silicon-oxygen group in the structure of grumantite Na[Si2O4(OH)]·H2O. Soviet Physics - Doklady: 34: 284-286.
Yamnova, N.Y., Pushcharovskii, D.Y., Andrianov, V.I., Rastsvetaeva, R.K., Khomyakov, A.P., Mikheeva, M.G. (1989) A new type of silicate radical in the structure of grumantite, Na[Si2O4(OH)].H2O. Doklady Akademii Nauk SSSR: 305(4): 868-871.
Zubkova, N.V., Pekov, I.V., Pushcharovsky, D.Y. (2014) A review of crystal chemistry of natural silicates of alkaline elements in the light of new structural data. Mineralogical Magazine: 78: 253-265.

Internet Links for GrumantiteHide

Localities for GrumantiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Murmansk Oblast
    • Khibiny Massif
      • Rasvumchorr Mt
        • Rasvumchorr Mine
Pekov I.V., Zubkova N.V., Filinchuk Ya.E., Chukanov N.V., Zadov A.E., Pushcharovsky D.Yu., Gobechiya E.R. (2010): Shlykovite, KCa[Si4O9(OH)]·3H2O, and cryptophyllite, K2Ca[Si4O10]·5H2O, two new mineral species from the Khibiny alkaline complex, Kola Peninsula, Russia. Zapiski RMO, 139(1), 37-50.
    • Lovozero Massif
ZVMO (1987) 116, 244-248
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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