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Tvedalite

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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).


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Classification of TvedaliteHide

Approved
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

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

Chemical Properties of TvedaliteHide

Formula:
(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
IMA Formula:
Ca4Be3Si6O17(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 (93)
5.80 (68)
3.87 (75)
3.16 (74)
2.889 (75)
2.837 (100)
2.494 (58)

Occurrences of TvedaliteHide

Paragenetic Mode(s):

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 μ in length). The spherulites are overgrown by a crust of chiavennite.
Geological Setting of Type Material:
In heavily zeolitized and hydrothermally parts of irregular nepheline syenite pegmatites

Synonyms of TvedaliteHide

Other Language Names for TvedaliteHide

German:Tvedalit
Spanish:Tvedalita

Common AssociatesHide

ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
Associated Minerals Based on Photo Data:
Chiavennite3 photos of Tvedalite associated with Chiavennite on mindat.org.
Analcime3 photos of Tvedalite associated with Analcime on mindat.org.
Aegirine1 photo of Tvedalite associated with Aegirine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DF.05Chesterite(Mg,Fe)17Si20O54(OH)6Orth.
9.DF.05Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon.
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.
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

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.3.1PhenakiteBe2SiO4Trig. 3 : R3
14.3.2BertranditeBe4(Si2O7)(OH)2Orth. mm2 : Cmc21
14.3.3BerylliteBe3(SiO4)(OH)2 · H2OOrth.
14.3.4LiberiteLi2BeSiO4Mon. m : Pm
14.3.5ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
14.3.6EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
14.3.7EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
14.3.8GugiaiteCa2Be(Si2O7)Tet.
14.3.9Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4Orth. mmm (2/m 2/m 2/m)
14.3.11BaryliteBe2Ba(Si2O7)Orth.
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.13Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
14.3.14Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10Mon. 2/m : P21/b
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
14.3.17TrimeriteCaMn2+2Be3(SiO4)3Mon. 2/m : P21/m
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24Orth.
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe3+2}(Be2Si6O22)(OH)2Mon.
14.3.23Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

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.

References for TvedaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Larsen, A. O., Åsheim, A., Raade, G. & Taftø, J. (1992): Tvedalite, (Ca,Mn)4Be3Si6O17(OH)4•H2O, a new mineral from syenite pegmatite in the Oslo Region, Norway. American Mineralogist: 77: 438-443.
New Minerals (1997), New Minerals 1990-1994.
Raade, G. (1996) Minerals originally described from Norway. Including notes on type material. Norsk Bergverksmuseum Skrift: 11: 104 pp. + plates 1-7.

Internet Links 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 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.
Norway
 
  • Telemark
    • Porsgrunn
      • Mørje
        • Sagåsen
Larsen, A.O., Åsheim, A. and Gault, R. A. (2005): Minerals of the eudialyte group from the Sagåsen larvikite quarry, Porsgrunn, Norway. Norsk Bergverksmuseum Skrifter 30: 58-62
  • Vestfold
    • Larvik
      • Tvedalen
Nordrum, F.S. (2002): Nyfunn av mineraler i Norge 2001-2002. STEIN 29 (2): 4-10; Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp
Nordrum, F. S. (2004): Nyfunn av mineraler i Norge 2003-2004. STEIN 31 (2), 36-44; Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp
        • Tuften (Tuften 1 Quarry; Tuften 2 Quarry)
Grice, J. D., Kristiansen, R., Friis, H., Rowe, R., Poirier, G.G., Selbekk, R.S., Cooper, M.A. & Larsen, A.O. (2013): Ferrochiavennite, a new beryllium silicate zeolite from syenite pegmatites in the Larvik Plutonic Complex, Oslo region, Southern Norway. Canadian Mineralogist. 51, 286.
Larsen, A. O.; Åsheim, A.; Raade, G. & Taftø, J. (1992): Tvedalite, (Ca,Mn)4Be3Si6O17(OH)4• 3H2O, a new mineral from syenite pegmatite in the Oslo Region, Norway, American Mineralogist 77, 438-443
Mineral and/or Locality  
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