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Folvikite

A valid IMA mineral species
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01703260017271951388325.jpg
Folvikite, etc.

Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
03283960017271952461920.jpg
Folvikite

Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
08136480017271952467997.jpg
Folvikite, etc.

Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
07071110017864945534191.jpg
Folvikite, etc.

Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
03283960017271952461920.jpg
Folvikite

Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
08136480017271952467997.jpg
Folvikite, etc.

Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
01703260017271951388325.jpg
Folvikite, etc.

Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
03283960017271952461920.jpg
Folvikite

Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
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About FolvikiteHide

02465550017271952474035.jpg
Harald Oskar Folvik
Formula:
Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4
Colour:
Black to dark reddish-brown
Lustre:
Sub-Metallic
Hardness:
6
Specific Gravity:
4.14 (Calculated)
Crystal System:
Monoclinic
Name:
Named after the Norwegian collector, Harald Oskar Folvik (1941-), who found the mineral.
First described as an "unnamed Mg-Mn-Sb-oxyborate" (Raade & Folvik 2013).
This page provides mineralogical data about Folvikite.


Unique IdentifiersHide

Mindat ID:
47930
Long-form identifier:
mindat:1:1:47930:3

IMA Classification of FolvikiteHide

Classification of FolvikiteHide

Strunz-mindat (2026):
6.AB.35

6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.

Mineral SymbolsHide

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

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

Physical Properties of FolvikiteHide

Lustre:
Sub-Metallic
Colour:
Black to dark reddish-brown
Streak:
Reddish-brown
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Density:
4.14 g/cm3 (Calculated)

Optical Data of FolvikiteHide

Type:
Biaxial
Pleochroism:
Strong
Comments:
Observed in plane-polarized light: AB = brown (intermediate), OB = dark brown (maximum), ON = honey brown (minimum).
Comments:
Indeterminate optic sign due to pervasive twinning

Chemistry of FolvikiteHide

Mindat Formula:
Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4
Element Weights:
Element% weight
O40.868 %
Mg31.042 %
Sb15.551 %
Mn7.017 %
B5.523 %

Calculated from ideal end-member formula.
O
Mg
Sb
Mn
B
Elements listed:
B, Mg, Mn, O, Sb - search for minerals with similar chemistry

Crystallography of FolvikiteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P2
Setting:
P2
Cell Parameters:
a = 5.377(1) Å, b = 6.211(1) Å, c = 10.939(2) Å
β = 94.399(9)°
Ratio:
a:b:c = 0.866 : 1 : 1.761
Unit Cell V:
364.22 ÅÂģ
Z:
1

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of FolvikiteHide

Type Locality:
ⓘ Kitteln Mine, Nordmark Odal Field, Filipstad, VÃĪrmland County, Sweden
General Appearance of Type Material:
As striated prismatic crystals up to 0.3 mm in calcite
Place of Conservation of Type Material:
The Natural History Museum, University of Oslo, Norway, catalogue number 43574, and the Canadian Museum of Nature, Ottawa, Canada, catalogue number CMNMC 87087
Empirical Formula of Type Material:
(Sb5+1.02Mn3+1.34Al0.05Fe3+0.05Mg5.46Mn2+3.82O0.26)ÎĢ=12O8(BO3)4
Chemical Analysis of Type Material:
Sb2O518.15 %
MgO24.11 %
MnO29.73 %
Mn2O311.62 %
Al2O30.27 %
Fe2O30.45 %
B2O315.27 %
Total:99.6 %
Geological Setting of Type Material:
Skarn
Associated Minerals at Type Locality:
Calcite
Reference:
Cooper, Mark A., Raade, Gunnar, Ball, Neil A., Abdu, Yassir A., Hawthorne, Frank C., Rowe, Ralph (2018) Folvikite, Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4, a new oxyborate mineral from the Kitteln mine, Nordmark ore district, VÃĪrmland, Sweden: description and crystal structure. Mineralogical Magazine, 82 (4) 821-836 doi:10.1180/minmag.2017.081.059

Synonyms of FolvikiteHide

Other Language Names for FolvikiteHide

Dutch:Folvikiet
German:Folvikit

Relationship of Folvikite to other SpeciesHide

Member of:
Pinakiolite Group
Other Members of Pinakiolite Group:
Aluminomagnesiohulsite(Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2Mon. 2/m : P2/m
HulsiteFe2+2Fe3+O2(BO3)Mon. 2/m : P2/m
MagnesiohulsiteMg2Fe3+O2(BO3)Mon. 2/m : P2/m
Pinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Mon. 2/m : B2/m

Common AssociatesHide

Associations Based on Photo Data:
2 photos of Folvikite associated with CalciteCaCO3

Related Minerals - Strunz-mindat GroupingHide

6.AB.ChubaroviteKZn2(BO3)Cl2Trig. 32 : R32
6.AB.Rhabdoborite-(Mo)Mg12Mo6+1.33O6(BO3)6F2Hex. 6 : P63
6.AB.05HambergiteBe2(BO3)(OH)Orth. mmm(2/m2/m2/m) : Pbca
6.AB.10BerboriteBe2(BO3)(OH) · H2OTrig.
6.AB.15JeremejeviteAl6(BO3)5(F,OH)3Hex. 6/m : P63/m
6.AB.20YuanfuliiteMg(Fe3+,Al)O(BO3)Orth. mmm(2/m2/m2/m) : Pnma
6.AB.20Warwickite(Mg,Ti,Fe,Al)2O(BO3)Orth. mmm(2/m2/m2/m) : Pnma
6.AB.25Karlite(Mg,Al)6.5(BO3)3(OH)4(â—ŧ,Cl)0.5Orth. 222 : P21212
6.AB.30MarinaiteCu2Fe3+O2(BO3)Mon. 2/m : P21/b
6.AB.30SavelievaiteMg2Cr3+O2(BO3)Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30FredrikssoniteMg2Mn3+O2(BO3)Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30VonseniteFe2+2Fe3+(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30LudwigiteMg2Fe3+(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30Azoproite(Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30BonaccorditeNi2Fe3+(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.35Pinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Mon. 2/m : B2/m
6.AB.40TakÃĐuchiite(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2Orth. mmm(2/m2/m2/m) : Pnnm
6.AB.40BlatteriteSb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32Orth. mmm(2/m2/m2/m) : Pnnm
6.AB.40Orthopinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Orth. mmm(2/m2/m2/m) : Pnnm
6.AB.40ChestermaniteMg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2Orth. mmm(2/m2/m2/m)
6.AB.45Aluminomagnesiohulsite(Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2Mon. 2/m : P2/m
6.AB.45HulsiteFe2+2Fe3+O2(BO3)Mon. 2/m : P2/m
6.AB.45MagnesiohulsiteMg2Fe3+O2(BO3)Mon. 2/m : P2/m
6.AB.50FluoboriteMg3(BO3)(F,OH)3Hex. 6/m : P63/m
6.AB.50HydroxylboriteMg3(BO3)(OH)3Hex. 6/m : P63/m
6.AB.55ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
6.AB.55WightmaniteMg5(BO3)O(OH)5 · 2H2OMon. 2/m
6.AB.60GaudefroyiteCa4Mn3+2-3(BO3)3(CO3)(O,OH)3Hex.
6.AB.65SakhaiteCa48Mg16(BO3)32(CO3)16 · 2(H2O,HCl)Iso. m3m(4/m32/m) : Fd3m
6.AB.70HarkeriteCa48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl)Trig. 3m(32/m) : R3m
6.AB.75Pertsevite-(F)Mg2(BO3)(F,OH)Orth. mm2 : Pna21
6.AB.75Pertsevite-(OH)Mg2(BO3)(OH)Orth. mmm(2/m2/m2/m) : Pnma
6.AB.80JacquesdietrichiteCu2(H2BO3)(OH)3Orth. mmm(2/m2/m2/m) : Pmna
6.AB.85Rhabdoborite-(V)Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1)Hex. 6 : P63
6.AB.85Rhabdoborite-(W)Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} Hex. 6 : P63
6.AB.85PainiteCaZrAl9(BO3)O15Hex. 6/m : P63/m
6.AB.90Mengxianminite(Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2Orth. mm2 : Fdd2

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 FolvikiteHide

References for FolvikiteHide

Localities for FolvikiteHide

Showing 1 localities.

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.
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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.
Sweden (TL)
 
  • VÃĪrmland County
    • Filipstad
      • Nordmark Odal Field
Raade et al. (2013) +1 other reference
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