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Tumchaite

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Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada

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Formula:
Na
 
2
Zr(Si
 
4
O
 
11
) · 2H
 
2
O
System:MonoclinicColour:Colourless to white
Lustre:VitreousHardness:4½
Name:For the discovery locality, the Tumcha River, near the Vuoriyarvi massif, North Karelia, Murmanskaja Oblast', Russia.
This page provides mineralogical data about Tumchaite.

Classification of Tumchaite

IMA status:Approved 1999
Nickel-Strunz 10th (pending) edition ID:9.EA.60

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
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Type Occurrence of Tumchaite

Type Locality:Vuoriyarvi alkaline-ultrabasic massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia

Physical Properties of Tumchaite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless to white
Streak:White
Hardness (Mohs):4½

Crystallography of Tumchaite

Crystal System:Monoclinic

Optical Data of Tumchaite

Type:Biaxial (-)
RI values: nα = 1.570 nβ = 1.588 nγ = 1.594
Maximum Birefringence:δ = 0.024

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

Chemical Properties of Tumchaite

Formula:
Na
 
2
Zr(Si
 
4
O
 
11
) · 2H
 
2
O
Essential elements:H, Na, O, Si, Zr
All elements listed in formula:H, Na, O, Si, Zr

Relationship of Tumchaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EA.05Cuprorivaite
CaCu[Si
 
4
O
 
10
]
9.EA.05Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
9.EA.05Effenbergerite
BaCu[Si
 
4
O
 
10
]
9.EA.05Wesselsite
SrCu[Si
 
4
O
 
10
]
9.EA.10Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.EA.15Apophyllite-(KF)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
9.EA.15Apophyllite-(KOH)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
9.EA.15Apophyllite-(NaF)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
9.EA.20Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
 · 3H
 
2
O
9.EA.25Dalyite
K
 
2
ZrSi
 
6
O
 
15
9.EA.25Davanite
K
 
2
TiSi
 
6
O
 
15
9.EA.30Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
9.EA.30Sazhinite-(La)
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
9.EA.35Armstrongite
CaZr[Si
 
6
O
 
15
] · 3H
 
2
O
9.EA.40Okenite
CaSi
 
2
O
 
5
 · 2H
 
2
O
9.EA.45Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
9.EA.50Cavansite
Ca(VO)Si
 
4
O
 
10
 · 4H
 
2
O
9.EA.55Pentagonite
Ca(VO)Si
 
4
O
 
10
 · 4H
 
2
O
9.EA.60Penkvilksite
Na
 
4
Ti
 
2
Si
 
8
O
 
22
 · 4H
 
2
O
9.EA.65Nabesite
Na
 
2
BeSi
 
4
O
 
10
 * 4 H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
AlSi
 
9
O
 
24
(OH)
 
6
 · 3H
 
2
O
9.EA.75Zeravshanite
Na
 
2
Cs
 
4
Zr
 
3
[Si
 
18
O
 
45
]*2H
 
2
O
9.EA.80Bussyite-(Ce)
(Ce,REE)
 
3
(Na,H
 
2
O)
 
6
MnSi
 
9
Be
 
5
(O,OH)
 
30
F
 
4
9.EA.85Plumbophyllite
Pb
 
2
Si
 
4
O
 
10
 · H
 
2
O

Other Names for Tumchaite

Synonyms:
IMA1999-041
Other Languages:
German:Tumchait
Russian:Тумчаит
Spanish:Tumchaita

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 Tumchaite

Reference List:

- +
American Mineralogist (2000): 85: 1516-1520.

Internet Links for Tumchaite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
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    • Localities for Tumchaite

    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.
    Canada
     
    • Québec
      • Montérégie
        • Rouville RCM
          • Mont Saint-Hilaire
    		AmMin 85:1516-1520(2000)
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    		[MinRec 32:311]
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 20th Jun 2011 00:26:53
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