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Tweddillite

A valid IMA mineral species
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07810320017056820958578.jpg
Tweddillite

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
02421930014950809517897.jpg
Tweddillite

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
08736130014958068876435.jpg
Tweddillite, etc.

Praborna Mine, Saint-Marcel, Aosta Valley, Italy
07810320017056820958578.jpg
Tweddillite

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
02421930014950809517897.jpg
Tweddillite

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
00204810014951100549261.jpg
Tweddillite, etc.

Praborna Mine, Saint-Marcel, Aosta Valley, Italy
00415960017056820968425.jpg
Tweddillite

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
02421930014950809517897.jpg
Tweddillite

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
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About TweddilliteHide

09829020014946312685941.jpg
Samuel M. Tweddill
Formula:
(CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH)
Colour:
Deep red
Lustre:
Vitreous
Hardness:
6 - 7
Specific Gravity:
3.84 (Calculated)
Crystal System:
Monoclinic
Name:
Named by T. Armbruster et al. in 2002 in honor of Samuel Milbourn Tweddill (3 April 1852, Scarborough, Yorkshire, England - 4 July 1917, Groenvlei Tin Mine, Limpopo, South Africa), the first curator of the Pretoria Geological Museum from 1897 to 1916. It was renamed manganipiemontite-(Sr) by the Epidote Subcommittee of the CNMMN in 2006 and reverted to tweddillite in 2015.
Clinozoisite Subgroup of Epidote Group.

The (Mn3+AlMn3+)-analogue of Unnamed (Fe3+-analogue of Piemontite-(Sr)).



Unique IdentifiersHide

Mindat ID:
11118
Long-form identifier:
mindat:1:1:11118:0
GUID
(UUID V4):
6cdccbe6-1729-4d8d-bd33-5583ecd1ddba

IMA Classification of TweddilliteHide

IMA status:
Approved
IMA Formula:
CaSr(Mn3+2Al)[Si2O7][SiO4]O(OH)
First published:
2002
Approval history:
Originally called tweddillite; renamed manganipiemontite-(Sr) by the Epidote Subcommittee of the CNMMN in 2006; reverted to tweddillite in 2015.
Type description reference:
Armbruster, T., Gnos, E., Dixon, R., Gutzmer, J., Hejny, C., Döbelin, N., Medenbach, O. (2002) Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals from the Kalahari manganese fields, South Africa. Mineralogical Magazine, 66 (1) 137-150 doi:10.1180/0026461026610018

Classification of TweddilliteHide

Strunz-mindat (2024):
9.BG.05

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination

Mineral SymbolsHide

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

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

Physical Properties of TweddilliteHide

Lustre:
Vitreous
Colour:
Deep red
Streak:
Brownish red
Hardness:
6 - 7 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
perfect after {001}
Fracture:
Sub-Conchoidal
Density:
3.84(3) g/cm3 (Calculated)

Optical Data of TweddilliteHide

Type:
Biaxial (+)
Pleochroism:
Strong
Comments:
Within the (001) blades, the crystals appear dark red parallel to b and orange-yellow parallel to a. Perpendicular to (001) the blades appear magenta to red.
Comments:
Average RI = 1.825.

Chemistry of TweddilliteHide

Mindat Formula:
(CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH)
Elements listed:
Al, Ca, H, Mn, O, Si, Sr - search for minerals with similar chemistry
Common Impurities:
Fe

Chemical AnalysisHide

Oxide wt%:
 12
SiO232.6 %33.0 %
ThO20.2 %0.2 %
Al2O312.9 %13.6 %
Ga2O30.1 % %
Cr2O30.1 % %
La2O39.2 %3.1 %
Ce2O30.2 %0.3 %
Pr2O31.5 %0.8 %
Nd2O32.6 %1.9 %
Sm2O30.1 %0.1 %
Mn2O315.0 %19.4 %
Fe2O31.5 %1.2 %
MnO1.4 %0.9 %
MgO2.2 %0.6 %
CaO10.6 %13.7 %
SrO7.2 %8.6 %
Na2O0.5 %0.2 %
H2O1.6 %1.7 %
Total:99.5 %99.3 %
Sample references:
IDLocalityReferenceNotes
1Praborna Mine, Saint-Marcel, Aosta Valley, Italy
Frank K. Mazdab collection, thin section FKM-171 (https://www.rockptx.com/fkm-151-to-fkm-175/#FKM-171)
EPMA data for zoned composite tweddellite-piemontite grains in Mn-rich schist. analysis spot #23
2  "  "
Frank K. Mazdab collection, thin section FKM-171 (https://www.rockptx.com/fkm-151-to-fkm-175/#FKM-171)
EPMA data for zoned composite tweddellite-piemontite grains in Mn-rich schist. analysis spot #34

Crystallography of TweddilliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 8.932(5) Å, b = 5.698(4) Å, c = 10.310(5) Å
β = 114.56(4)°
Ratio:
a:b:c = 1.568 : 1 : 1.809
Unit Cell V:
477.25 ų (Calculated from Unit Cell)
Twinning:
All crystals are (100) twinned.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014561TweddilliteArmbruster T, Gnos E, Dixon R, Gutzmer J, Hejny C, Dobelin N, Medenbach O (2002) Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals from the Kalahari manganese fields, South Africa Mineralogical Magazine 66 137-1502002Kalahari manganese fields, South Africa0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.936 Å(100)
2.703 Å(80)
2.586 Å(80)
2.182 Å(80)
3.515 Å(50)
2.149 Å(40)
2.415 Å(30)
2.320 Å(30)
2.126 Å(30)
1.8957 Å(30)
1.7178 Å(30)
1.6695 Å(30)

Type Occurrence of TweddilliteHide

Type Locality:
ⓘ Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
General Appearance of Type Material:
Dark-red ‘suns’ of very thin (~0.02 mm) radiating (001) blades, elongated parallel to [010] (up to 0.5 mm).
Place of Conservation of Type Material:
(NMBE 35475) at the Natural History Museum, Bern, Switzerland.
Geological Setting of Type Material:
In calcsilicate rocks formed as hydrothermal alteration of primary sedimentary manganese ore.
Associated Minerals at Type Locality:
SeranditePectoliteBraunite
Reference:
Armbruster, T., Gnos, E., Dixon, R., Gutzmer, J., Hejny, C., Döbelin, N., Medenbach, O. (2002) Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals from the Kalahari Manganese fields, South Africa. Mineralogical Magazine: 66: 137-150.
Download:
https://rruff.info/rruff_1.0/uploads/MM66_137.pdf

Synonyms of TweddilliteHide

Other Language Names for TweddilliteHide

Relationship of Tweddillite to other SpeciesHide

Member of:
Epidote Group > Epidote Supergroup
Other Members of this group:
Clinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Epidote-(Sr)(CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Hancockite(CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Heflikite(CaCa)(AlAlSc)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Mukhinite(CaCa)(AlAlV3+)O[Si2O7][SiO4](OH)Mon.
Niigataite(CaSr)(AlAlAl)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Piemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Piemontite-(Pb)(CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Piemontite-(Sr)(CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
Unnamed (Fe3+ analogue of Piemontite-(Pb))(CaPb)(Fe3+AlMn3+)O[Si2O7][SiO4](OH)
Unnamed (Fe3+-analogue of Piemontite)(CaCa)(Fe3+AlMn3+)O[Si2O7][SiO4](OH)
Unnamed (Fe3+-analogue of Piemontite-(Sr))(CaSr)(Fe3+AlMn3+)O[Si2O7][SiO4](OH)
Unnamed (Ga-analogue of Epidote)(CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH)

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Tweddillite associated with Strontium-bearing Piemontite{(Ca,Sr)2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
1 photo of Tweddillite associated with BrauniteMn2+Mn3+6(SiO4)O8
1 photo of Tweddillite associated with CryptomelaneK(Mn4+7Mn3+)O16
1 photo of Tweddillite associated with AegirineNaFe3+Si2O6
1 photo of Tweddillite associated with AlurgiteK(Al,Mn3+)2(AlSi3O10)(OH)2
1 photo of Tweddillite associated with HennomartiniteSrMn3+2(Si2O7)(OH)2 · H2O
1 photo of Tweddillite associated with SugiliteKNa2Fe3+2Li3[Si12O30]

Related Minerals - Strunz-mindat GroupingHide

9.BG.Shuiskite-(Cr)Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2OMon. 2/m : B2/m
9.BG.Alnaperbøeite-(Ce)Ca(Ce2.5Na0.5)(AlAl2Al)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.MagnesiovesuvianiteCa19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.AlumovesuvianiteCa19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.Zoisite-(Pb)(CaPb)(AlAlAl)O[Si2O7][SiO4](OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.Vielleaureite-(Ce)(Mn2+Ce)(MgAlMn2+)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.Heflikite(CaCa)(AlAlSc)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.Zilbermintsite-(La)(CaLa5)(Fe3+Al3Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m
9.BG.05bAllanite-(Ce)(CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(La)(CaLa)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Y)(CaY)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon.
9.BG.05aClinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bDissakisite-(Ce)(CaCe)(AlAlMg)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Dollaseite-(Ce)(CaCe)(MgAlMg)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aHancockite(CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Khristovite-(Ce)(CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aMukhinite(CaCa)(AlAlV3+)O[Si2O7][SiO4](OH)Mon.
9.BG.05aPiemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Piemontite-(Sr)(CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bManganiandrosite-(La)(Mn2+La)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Niigataite(CaSr)(AlAlAl)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Manganiandrosite-(Ce)(Mn2+Ce)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Dissakisite-(La)(CaLa)(AlAlMg)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Vanadoandrosite-(Ce)(Mn2+Ce)(V3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Uedaite-(Ce)(Mn2+Ce)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aEpidote-(Sr)(CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bUnnamed (Mg-analogue of Ferriallanite-(Ce))(CaCe)(Fe3+AlMg)O[Si2O7][SiO4](OH)
9.BG.05bUnnamed (Mn3+-analogue of Ferriakasakaite-(Ce))(CaCe)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)
9.BG.05bFerriallanite-(La)(CaLa)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bÅskagenite-(Nd)(Mn2+Nd)(AlAlFe3+)O[Si2O7][SiO4]OMon. 2/m : P21/m
9.BG.05Piemontite-(Pb)(CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bVanadoallanite-(La)(CaLa)(V3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bFerriakasakaite-(La)(CaLa)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Ferriandrosite-(La)(Mn2+La)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Androsite-(Ce)(Mn2+Ce)(AlAlMn2+)O[Si2O7][SiO4](OH)
9.BG.05Ferriandrosite-(Ce)(Mn2+Ce)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05a vUnnamed (Ga-analogue of Epidote)(CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH)
9.BG.05bUM1989-32-SiO:AlCaFeHREE(Ca0.5◻0.5REE)(AlAlFe3+)O[Si2O7][SiO4](OH)
9.BG.05bManganiakasakaite-(La)(CaLa)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bFerriakasakaite-(Ce)(CaCe)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Sm)(CaSm)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.10Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.15MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.15SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
9.BG.20OkhotskiteCa2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Fe3+)Ca2Fe3+Al2(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon. 2/m
9.BG.20Shuiskite-(Mg)Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2OMon.
9.BG.20Pumpellyite-(Al)Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20PoppiiteCa2V3+V3+2[Si2O6OH][SiO4](OH)2OMon. 2/m : B2/m
9.BG.20Julgoldite-(Mg)Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH)Mon.
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex. 6 : P6
9.BG.25WayneburnhamitePb9Ca6(Si2O7)3(SiO4)3Hex. 6 : P6
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon. 2/m : B2/b
9.BG.35VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35WiluiteCa19MgAl4(Al,Mg)8(B,◻)4◻[Si2O7]4[(SiO4)10]O(O,OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35ManganvesuvianiteCa19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.35FluorvesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35CyprineCa19Cu2+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.35HongheiteCa19Fe2+Al4(Fe3+,Mg)8(◻4)B[Si2O7]4[(SiO4)10]O(OH,O)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35Milanriederite(Ca18[REE])Fe3+Al4(Mg4Al4)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35Manaevite-(Ce)(Ca13Ce4[H2O]2)Mg(Al3Mg)(Mg3Ti3Fe3+2)(◻4)◻[Si2O7]4[(SiO4)8(H4O4)2]O(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7Mon.
9.BG.45DellaiteCa6Si3O11(OH)2Tric.
9.BG.50Gatelite-(Ce)CaCe3(AlAl2Mg)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/b
9.BG.50Perbøeite-(Ce)CaCe3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 Mon. 2/m : P21/m
9.BG.50Ferriperbøeite-(Ce)CaCe3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.50Ferriperbøeite-(La) CaLa3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.50Perbøeite-(La)CaLa3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 Mon. 2/m : P21/m
9.BG.55Västmanlandite-(Ce)CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2Mon. 2/m : P21/m
9.BG.60Radekškodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m
9.BG.60Radekškodaite-(Ce)(CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m
9.BG.60Radekškodaite Group(CaM5)([Fe3+Al3]Fe2+)[Si2O7][SiO4]5O(OH)3

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 TweddilliteHide

References for TweddilliteHide

Localities for TweddilliteHide

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.
Italy
 
  • Aosta Valley
    • Saint-Marcel
Frank K. Mazdab collection (see https://www.rockptx.com/fkm-151-to-fkm-175/#FKM-171 for normalized analysis)
Japan
 
  • Ehime Prefecture
Fukushima et al. (2005)
Lapis 2002 (11) +1 other reference
South Africa (TL)
 
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Joe Morolong Local Municipality
Lapis 2002 (11) +1 other reference
Spain
 
  • Canary Islands
    • Santa Cruz de Tenerife Province
      • Tenerife
Dill et al. (2023)
Dill et al. (2023)
Dill et al. (2023)
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