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Folvikite

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About FolvikiteHide

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.


Classification of FolvikiteHide

Approved, Pending publication
Approval Year:
2016

Physical Properties of FolvikiteHide

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

Chemical Properties of FolvikiteHide

Formula:
Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4

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:
364.25 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.450(100)
4.973(46)
3.112(32)
2.725(82)
2.591(91)
2.486(31)
2.033(43)
1.552(37)

Type Occurrence of FolvikiteHide

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
Associated Minerals at Type Locality:

Synonyms of FolvikiteHide

Relationship of Folvikite to other SpeciesHide

Other Members of this group:
Aluminomagnesiohulsite(Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2Mon. 2/m
Hulsite(Fe2+,Mg)2(Fe3+,Sn)(BO3)O2Mon.
Magnesiohulsite(Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2Mon.
Pinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Mon.

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 FolvikiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Raade, G. & Folvik, H. (2013): On an unnamed Mg-Mn-Sb oxyborate from the blatterite locality of the Kitteln Mine, Nordmark, Filipstad, Värmland, Sweden. Norsk Bergverksmuseum Skrifter. 50: 49-54 http://www.nags.net/Mineralsymposium/2013/2013-Raade_&_Folvik.pdf
Cooper, M.A., Raade, G., Ball, N., Abdu, Y., Hawthorne, F.C. and Rowe, R. (2016) Folvikite, IMA 2016-026. CNMNC NewsletterNo. 32, August 2016, page 919; Mineralogical Magazine, 80: 915–922.

Internet Links for FolvikiteHide

Localities for FolvikiteHide

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.
Sweden (TL)
 
  • Värmland
    • Filipstad
      • Nordmark Odal Field (Nordmarksberg)
Raade, G. & Folvik, H. (2013): On an unnamed Mg-Mn-Sb oxyborate from the blatterite locality of the Kitteln Mine, Nordmark, Filipstad, Värmland, Sweden. Norsk Bergverksmuseum Skrifter. 50, 49-54; Cooper, M.A., Raade, G., Ball, N., Abdu, Y., Hawthorne, F.C. and Rowe, R. (2016) Folvikite, IMA 2016-026. CNMNC NewsletterNo. 32, August 2016, page 919; Mineralogical Magazine, 80: 915–922.
Mineral and/or Locality  
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