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Tvedalite

A valid IMA mineral species
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About TvedaliteHide

Formula:
(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
Colour:
Creamy-white, light beige
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.541
Crystal System:
Orthorhombic
Name:
Named after its discovery locality, Vevja quarry, Tvedalen area, Vestfold, Norway.
May belong to the Zeolite Group (uncertain since crystal structure has not been determined yet).


Unique IdentifiersHide

Mindat ID:
4065
Long-form identifier:
mindat:1:1:4065:1
GUID
(UUID V4):
2e1979e0-7ad0-4218-8859-dc004c01ba9d

IMA Classification of TvedaliteHide

Approved
IMA Formula:
Ca4Be3Si6O17(OH)4 · 3H2O
First published:
1992

Classification of TvedaliteHide

9.DF.20

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
70.5.2.1

70 : INOSILICATES Column or Tube Structures
5 : Column or Tube Structures with chains linked by Be
14.3.19

14 : Silicates not Containing Aluminum
3 : Silicates of Be

Mineral SymbolsHide

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

SymbolSourceReference
TveIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of TvedaliteHide

Vitreous
Transparency:
Translucent
Colour:
Creamy-white, light beige
Streak:
White
Hardness:
4½ on Mohs scale
Hardness Data:
Estimated
Cleavage:
Perfect
{010}
Density:
2.541 g/cm3 (Measured)    2.554 g/cm3 (Calculated)

Optical Data of TvedaliteHide

Type:
Biaxial
Dispersion:
r > v

Chemistry of TvedaliteHide

Mindat Formula:
(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
Common Impurities:
Al,Fe

Crystallography of TvedaliteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 8.72 Å, b = 23.14 Å, c = 4.92 Å
Ratio:
a:b:c = 0.377 : 1 : 0.213
Unit Cell V:
992.76 ų (Calculated from Unit Cell)
Comment:
C-centered lattice, space group unknown

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.6 Å(93)
5.80 Å(68)
3.87 Å(75)
3.16 Å(74)
2.889 Å(75)
2.837 Å(100)
2.494 Å(58)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of TvedaliteHide

General Appearance of Type Material:
Spherulites up to 3 mm in diameter composed of densely packed, radially oriented platelets (a few μm in length). The spherulites are overgrown by a crust of chiavennite.
Place of Conservation of Type Material:
University of Oslo, Oslo, Norway, 14770.
Geological Setting of Type Material:
In heavily zeolitized and hydrothermally parts of irregular nepheline syenite pegmatites.
Associated Minerals at Type Locality:

Synonyms of TvedaliteHide

Other Language Names for TvedaliteHide

German:Tvedalit
Spanish:Tvedalita

Common AssociatesHide

Associated Minerals Based on Photo Data:
10 photos of Tvedalite associated with ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
4 photos of Tvedalite associated with AnalcimeNa(AlSi2O6) · H2O
2 photos of Tvedalite associated with NatroliteNa2Al2Si3O10 · 2H2O
1 photo of Tvedalite associated with AegirineNaFe3+Si2O6

Related Minerals - Strunz-mindat GroupingHide

9.DF.BohseiteCa4Be3+xAl1-xSi9O25-x(OH)3+xOrth. mmm (2/m 2/m 2/m) : Cmcm
9.DF.05Chesterite(Mg,Fe)17Si20O54(OH)6Orth. mm2
9.DF.05Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon. 2/m : B2/b
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
9.DF.15ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2OTric. 1 : P1
9.DF.15ParaershoviteNa3K3Fe3+2Si8O20(OH)4 · 4H2OTric. 1 : P1
9.DF.25BaveniteCa4Be2Al2Si9O26(OH)2Orth. mm2
9.DF.30BigcreekiteBaSi2O5 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma

Fluorescence of TvedaliteHide

non-fluorescent

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.

Internet Links for TvedaliteHide

References for TvedaliteHide

Localities for TvedaliteHide

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 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.
Norway
 
  • Telemark
    • Porsgrunn
      • Auenlandet
        • Sagåsen
Larsen et al. (2005)
  • Vestfold
    • Larvik
      • Tvedalen
Nordrum (2002) +1 other reference
Nordrum (2004) +1 other reference
        • Tuften
Grice et al. (2013)
Åsheim +3 other references
 
Mineral and/or Locality  
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