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Grumantite

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Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Peter Kohorst

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Formula:
Na[Si
 
2
O
 
4
(OH)]·H
 
2
O
System:OrthorhombicColour:white
Hardness:4 - 5
Name:From an old Russian name for the Spitzbergen Archipelago
This page provides mineralogical data about Grumantite.

Classification of Grumantite

IMA status:Approved 1985
Strunz 8th edition ID:8/F.36-02
Nickel-Strunz 10th (pending) edition ID:9.EH.10

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
Dana 8th edition ID:78.4.5.1

78 : Unclassified Silicates
4 :
Hey's CIM Ref.:14.1.7

14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals
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Type Occurrence of Grumantite

Type Locality:Severnaya mine, Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
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

Physical Properties of Grumantite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:white
Streak:white
Hardness (Mohs):4 - 5
Hardness Data:Measured
Cleavage:Perfect
on {100}
Fracture:Step-Like
Density (measured):2.21 g/cm3
Density (calculated):2.26 g/cm3

Crystallography of Grumantite

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Space Group:Fdd2
Cell Parameters:a = 15.979Å, b = 18.25Å, c = 7.169Å
Ratio:a:b:c = 0.876 : 1 : 0.393
Unit Cell Volume:V 2,090.60 ų (Calculated from Unit Cell)
Z:16

Optical Data of Grumantite

Type:Biaxial (+)
RI values: nα = 1.494 nβ = 1.507 nγ = 1.523
2V:Measured: 83° to 87°, Calculated: 84°
Maximum Birefringence:δ = 0.029

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:weak

Chemical Properties of Grumantite

Formula:
Na[Si
 
2
O
 
4
(OH)]·H
 
2
O
Essential elements:H, Na, O, Si
All elements listed in formula:H, Na, O, Si

Relationship of Grumantite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EH.05Manganoneptunite
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
Ti
 
2
[Si
 
8
O
 
24
]
9.EH.05Neptunite
Na
 
2
KLi(Fe
2+
 
,Mn
2+
 
)
 
2
Ti
 
2
[Si
 
8
O
 
24
]
9.EH.05Watatsumiite
Na
 
2
KLi(Mn
2+
 
,Fe
2+
 
)
 
2
V
4+
2
[Si
 
8
O
 
24
]
9.EH.05IMA2009-009
KNa
 
2
Li(Mg,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
9.EH.15Sarcolite
Na
 
2
Ca
 
12
(Ca,K,Fe,Sr,Mg)
 
2
Al
 
8
Si
 
12
(P,Si)O
 
52
F
 
2
9.EH.20Ussingite
Na
 
2
AlSi
 
3
O
 
8
OH
9.EH.25Leifite
(Na,H
 
2
O)Na
 
6
[F
 
2
|Be
 
2
Al
 
2
(Al,Si)Si
 
15
O
 
39
]
9.EH.25Telyushenkoite
(Cs,Na,K)Na
 
6
[F
 
2
|Be
 
2
Al
 
3
Si
 
15
O
 
39
]
9.EH.25Eirikite
KNa
 
6
Be
 
2
(Si
 
15
Al
 
3
)O
 
39
F
 
2
9.EH.30Nafertisite
Na
 
3
(Fe
2+
 
,Fe
3+
 
)
 
6
(Ti
 
2
Si
 
12
O
 
34
)(O,OH)
 
7
·2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.1.1Natrosilite
Na
 
2
Si
 
2
O
 
5
14.1.2Ertixiite
Na
 
2
Si
 
4
O
 
9
14.1.3Revdite
Na
 
16
Si
 
16
O
 
27
(OH)
 
26
·28H
 
2
O
14.1.4Makatite
Na
 
2
Si
 
4
O
 
8
(OH)
 
2
·4H
 
2
O
14.1.5Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
·3H
 
2
O
14.1.6Kenyaite
Na
 
2
Si
 
22
O
 
41
(OH)
 
8
·6H
 
2
O
14.1.8Silinaite
NaLiSi
 
2
O
 
5
·2H
 
2
O

Other Names for Grumantite

Synonyms:
IMA1985-029
Other Languages:
German:Grumantit
Russian:Грумантит
Spanish:Grumantita

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 Grumantite

Reference List:Zap.Vses. Mineral.Obshch.:116:244-248 (1987) - American Mineralogist: 73: 440 (1988)[abstract]

Zeit. Krist.:185, 612 (1988)

Doklady Akademii Nauk SSSR: 305: 868-871.

Internet Links for Grumantite

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    Localities for Grumantite

    (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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • 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
    No reference listed
    Mineral and/or Locality
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