Grumantite (original) (raw)

A valid IMA mineral species

About GrumantiteHide

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Lustre:

Vitreous, Silky, Dull

Crystal System:

Orthorhombic

Name:

From an old Russian name for the Spitzbergen Archipelago.

This page provides mineralogical data about Grumantite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1757:8

99acf463-107c-4784-9a02-c80f17d41bdc

IMA Classification of GrumantiteHide

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IMA Formula:

NaSi2O4(OH) · H2O

Type description reference:

Classification of GrumantiteHide

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9.EH.10

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

78.4.5.1

78 : Unclassified Silicates
4 :

14.1.7

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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of GrumantiteHide

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Comment:

Aggregates dull to silky, single crystals vitreous

Density:

2.21 g/cm3 (Measured) 2.26 g/cm3 (Calculated)

Optical Data of GrumantiteHide

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RI values:

_n_α = 1.494(2) _n_β = 1.507(2) _n_γ = 1.523(2)

2V:

Measured: 83° to 87°, Calculated: 84.9°

δ = 0.029

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Optical Extinction:

X = a, Y = c, Z = b

Chemistry of GrumantiteHide

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Mindat Formula:

Na(HSi2O5) · H2O

Crystallography of GrumantiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - Pyramidal

Cell Parameters:

a = 15.979 Å, b = 18.25 Å, c = 7.169 Å

Ratio:

a:b:c = 0.876 : 1 : 0.393

Unit Cell V:

2,090.60 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of GrumantiteHide

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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

Associated Minerals at Type Locality:

Reference:

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.

Synonyms of GrumantiteHide

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Other Language Names for GrumantiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of GrumantiteHide

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Other InformationHide

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Thermal Behaviour:

The DTA curve exhibits marked endothermal effects at 280°C (dehydration), 700°C (phase transition), and 760°C (melting).

Notes:

Insoluble in cold water and cold 10% HCl, readily
soluble in hot 10% HCl giving a silicic residue.

Health Risks:

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

Internet Links for GrumantiteHide

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References for GrumantiteHide

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Reference List:

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.

Localities for GrumantiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.