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Friisite

A valid IMA mineral species
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08271560017751491774955.jpg
Henrik Friis
Formula:
Pb8Al3Si8O27Cl3
Colour:
white to colorless
Lustre:
Sub-Adamantine
Hardness:
4 - 5
Specific Gravity:
5.54 (Calculated)
Crystal System:
Hexagonal
Name:
Named in honor of the Danish mineralogist Henrik Friis (b. 1977), professor at the Natural History Museum, University of Oslo, Norway, in recognition of his significant contributions to Nordic (including Greenlandic) mineralogy.
Isostructural with:
Jagoite
Was found in a museum specimen of jagoite with heterogeneous skarn associated with hematite ore, collected from the Canberra stope at 220 m depth in the mine.


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Unique IdentifiersHide

Mindat ID:
471483
Long-form identifier:
mindat:1:1:471483:1

Similar NamesHide

FarrisiteA rock subtype
FrieseiteAg2Fe5S8 (?)

IMA Classification of FriisiteHide

Classification of FriisiteHide

Strunz-mindat (2026):
9.EG.50

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings

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

Physical Properties of FriisiteHide

Lustre:
Sub-Adamantine
Transparency:
Transparent
Colour:
White to colorless
Streak:
White
Hardness:
4 - 5 on Mohs scale
Comment:
by analogy with jagoite
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
Parting:
none
Fracture:
Irregular/Uneven
Density:
5.54(1) g/cm3 (Calculated)

Optical Data of FriisiteHide

Type:
Uniaxial (-)
Pleochroism:
Non-pleochroic
Comments:
with a calculated average refractive index of n=1.88 using Gladstone–Dale constants

Chemistry of FriisiteHide

Mindat Formula:
Pb8Al3Si8O27Cl3
Element Weights:
Element% weight
Pb66.262 %
O17.269 %
Si8.982 %
Cl4.252 %
Al3.236 %

Calculated from ideal end-member formula.
Pb
O
Si
Cl
Al
Elements listed:
Al, Cl, O, Pb, Si - search for minerals with similar chemistry

Chemical AnalysisHide

Oxide wt%:
 1
Na2O0.14 %
Al2O34.42 %
SiO219.80 %
Cl4.19 %
CaO0.19 %
MnO0.31 %
Fe2O30.63 %
ZnO0.42 %
PbO69.83 %
O=Cl-0.94 %
Total:98.99 %
Empirical formulas:
Sample IDEmpirical Formula
1(Pb7.89Na0.11CaO0.08)Σ8.8(Al2.19Si0.31Fe3+0.20Zn0.13Mn2+0.11)Σ2.94Si8O27.02Cl2.98
Sample references:
IDLocalityReferenceNotes
1Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
Holtstam, Dan; Cámara, Fernando; Karlsson, Andreas (2026) Friisite, Pb8Al3Si8O27Cl3, a new mineral with a polysomatic relation to jagoite, from Långban, Sweden. European Journal of Mineralogy, 38 (2). 169-177 doi:10.5194/ejm-38-169-2026
EMPA data, normalized on a basis of 30 anions (O + Cl)

Crystallography of FriisiteHide

Crystal System:
Hexagonal
Class (H-M):
6m2 - Ditrigonal Dipyramidal
Space Group:
P62c
Cell Parameters:
a = 8.5955(1) Å, c = 23.4092(2) Å
Ratio:
a:c = 1 : 2.723
Unit Cell V:
1,497.82 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Type Occurrence of FriisiteHide

Type Locality:
ⓘ Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden
General Appearance of Type Material:
subhedral, flaky grains up to 150 µm in size, forming aggregates
Place of Conservation of Type Material:
Type material is deposited in the collections of the Department of Geosciences, Swedish Museum of Natural History, Box 50007, SE-10405 Stockholm, Sweden, collection number GEO-NRM #19610234
Geological Setting of Type Material:
within a medium-grained skarn matrix and contiguous to jagoite. friisite likely crystallized after the main skarn-forming event (post-peak metamorphism) from the transformation of earlier-formed lead silicates, melanotekite (Mtk), or barysilite (Bsl).
Associated Minerals at Type Locality:
AlamositeAlbiteBaryteFluorapophyllite-(K)Jagoite
MargarosaniteMelanotekiteMelanotekiteNative LeadSerpentine Subgroup
Reference:
Holtstam, Dan; Cámara, Fernando; Karlsson, Andreas (2026) Friisite, Pb8Al3Si8O27Cl3, a new mineral with a polysomatic relation to jagoite, from Långban, Sweden. European Journal of Mineralogy, 38 (2). 169-177 doi:10.5194/ejm-38-169-2026

Synonyms of FriisiteHide

Other Language Names for FriisiteHide

Dutch:Friisiet
German:Friisit

Related Minerals - Strunz-mindat GroupingHide

9.EG.05CymriteBaAl2Si2(O,OH)8 · H2OMon. 2 : P21
9.EG.10Naujakasite(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26Mon.
9.EG.10ManganonaujakasiteNa6(Mn2+,Fe2+)Al4Si8O26Mon. 2/m : B2/m
9.EG.15DmisteinbergiteCa(Al2Si2O8)Trig. 32 : P312
9.EG.20KampfiteBa12(Si11Al5)O31(CO3)8Cl5Mon. m
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
9.EG.25SträtlingiteCa2Al2SiO7 · 8H2OTrig. 3m : R3m
9.EG.30Eggletonite(Na,K,Ca)xMn6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11)Mon.
9.EG.30Ganophyllite(K,Na)xMn2+6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11)Mon. 2/m
9.EG.30Tamaite(Ca,K,Na)xMn6(Si,Al)10O24(OH)4 · nH2O (x = 1-2; n = 7-11)Mon. 2/m : P21/b
9.EG.35ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
9.EG.35CoombsiteKMn2+13(Si,Al)18O42(OH)14Trig.
9.EG.40'Chalcodite'K(Fe3+,Mg,Fe2+)8(Si,Al)12(O,OH)27Tric. 1 : P1
9.EG.40Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2OMon. 2/m : B2/m
9.EG.40LennilenapeiteK4Mn2+48[Si64Al8]O164(OH)52 · nH2OTric.
9.EG.40StilpnomelaneK4Fe2+48[Si64Al8]O164(OH)52 · nH2OTric. 1 : P1
9.EG.45Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)Mon. 2 : P21
9.EG.45LevantiteKCa3Al2(SiO4)(Si2O7)(PO4)Mon. 2 : P21
9.EG.45TuscaniteKCa6(Si,Al)10O22(SO4,CO3)2(OH) · H2OMon. 2/m : P21/b
9.EG.50JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex. 6m2 : P6c2
9.EG.55WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P31c
9.EG.60HyttsjöitePb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2OTrig. 3 : R3
9.EG.65ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2OMon. 2/m : B2/m
9.EG.70RoymilleritePb24Mg9(Si10O28)(CO3)10(BO3)(SiO4)(OH)13O5Tric. 1 : P1
9.EG.70Britvinite[Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]Tric. 1 : P1
9.EG.75KayupovaiteNa2Mn10[(Si14Al2)O38(OH)8] · 7H2OMon. 2/m : B2/b
9.EG.75'UM1989-30-SiO:AlBaCaFeHKMgMn'(Ba,Ca)(Mn,Fe,Mg)22(Si,Al)32O76(OH)16 · 12H2O
9.EG.75Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b

Fluorescence of FriisiteHide

In UV light:
does not fluoresce under UV light

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 FriisiteHide

References for FriisiteHide

Localities for FriisiteHide

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)
 
  • Värmland County
    • Filipstad
      • Långban Ore District
Holtstam et al. (2024) +1 other reference
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