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Hemloite

A valid IMA mineral species
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Hemlo aerial

Williams Mine, Hemlo gold deposit, Bomby Township, Thunder Bay District, Ontario, Canada
Formula:
(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)
Colour:
Black
Lustre:
Metallic, Sub-Metallic
Hardness:
6½
Specific Gravity:
4.613 (Calculated)
Crystal System:
Triclinic
Name:
Named for the type locality, the Hemlo gold deposit, 35 km east of Marathon, Ontario, Canada.
This page provides mineralogical data about Hemloite.


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Unique IdentifiersHide

Mindat ID:
1861
Long-form identifier:
mindat:1:1:1861:2

Similar NamesHide

Hamelitea hydrated (H2O) Silicate of Al, Fe and Mg
HomiliteA valid IMA mineral species - grandfatheredCa2(Fe2+,Mg)B2Si2O10
HuemuliteA valid IMA mineral speciesNa4Mg(V10O28) · 24H2O

IMA Classification of HemloiteHide

IMA status:
Approved
IMA Formula:
(Ti4+,V3+,Fe3+,Al)12As3+2O23(OH)
Approval year:
1987
First published:
1989

Classification of HemloiteHide

Strunz-mindat (2026):
4.JB.60

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
Dana 8th ed.:
46.2.4.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous
Hey's CIM Ref.:
24.3.3

24 : Antimonates and Antimonites
3 : Antimonates of Ti and Pb

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

Physical Properties of HemloiteHide

Lustre:
Metallic, Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
6½ on Mohs scale
Hardness:
VHN100=859 - 967 kg/mm2 - Vickers
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.613 g/cm3 (Calculated)
Comment:
Could not be measured due to inclusions.

Optical Data of HemloiteHide

Anisotropism:
Weak, dark grey to dark brown rotation-tints.
Bireflectance:
None observed.
Reflectivity:
WavelengthR1 (%)R2 (%)
400nm18.9%20.5%
420nm18.6%19.8%
440nm18.2%19.1%
460nm17.8%18.7%
480nm17.6%18.4%
500nm17.4%18.2%
520nm17.2%18.0%
540nm17.1%17.8%
560nm17.0%17.7%
580nm17.0%17.6%
600nm16.9%17.5%
620nm16.9%17.4%
640nm16.8%17.4%
660nm16.8%17.3%
680nm16.8%17.3%
700nm16.8%17.2%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 20.5%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Gray
Pleochroism:
Not Visible

Chemistry of HemloiteHide

Mindat Formula:
(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)
Element Weights:
Element% weight
Ti51.784 %
O34.617 %
As13.509 %
H0.091 %

Calculated from ideal end-member formula.
Elements listed:
Al, As, Fe, H, O, Sb, Ti, V - search for minerals with similar chemistry
Common Impurities:
Al

Crystallography of HemloiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.552 Å, b = 15.842 Å, c = 7.158 Å
α = 78.36°, β = 84.97°, γ = 86.78°
Ratio:
a:b:c = 0.477 : 1 : 0.452
Unit Cell V:
834.88 ų (Calculated from Unit Cell)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005230HemloiteHarris D C, Hoskins B F, Grey I E, Criddle A J, Stanley C J (1989) Hemloite (As,Sb)2(Ti,V,Fe,Al)12O23OH: A new mineral from the Hemlo gold deposit, Hemlo, Ontario, and its crystal structure The Canadian Mineralogist 27 427-4401989Hemlo gold deposit, Hemlo, Ontario, Canada0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.924 Å(100)
2.722 Å(90)
2.665 Å(90)
2.799 Å(80)
3.045 Å(70)
2.498 Å(70)
1.774 Å(60)
Comments:
Hemlo deposit, Ontario, Canada. Data from the type description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47d : [Arsenates, antimonates, selenates, bismuthinates]

Type Occurrence of HemloiteHide

Type Locality:
ⓘ Williams Mine (Page Williams Mine), Hemlo gold deposit, Bomby Township, Thunder Bay District, Ontario, Canada
General Appearance of Type Material:
Subhedral to anhedral grains up to 400 x 600 µm in size.
Place of Conservation of Type Material:
The British Museum, London, specimen BM 1986, 512, polished section E.1210 and as drill core and polished sections in the Systematic Reference Series of the National Mineral Collection, Geological Survey of Canada, Ottawa, catalogue number NMC 65544.
Geological Setting of Type Material:
Gold deposit.
Associated Minerals at Type Locality:
ArsenopyriteMicroclineMolybdeniteMuscovitePyrite
QuartzRutile

Synonyms of HemloiteHide

Other Language Names for HemloiteHide

Dutch:Hemloiet
German:Hemloit
Russian:Эмлоит
Spanish:Hemloita

Related Minerals - Strunz-mindat GroupingHide

4.JB.CuyaiteCa2Mn3+As3+14O24ClMon. m
4.JB.BrattforsiteMn19(AsO 3)12Cl2Mon. 2/m : B2/b
4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2Mon. 2/m : P21/m
4.JB.10ManganarsiteMn3(As2O4)(OH)4Trig.
4.JB.15'UM1984-09-AsO:ClHMn'Mn10As6O18(OH)ClTet. 4/mmm(4/m2/m2/m) : I41/acd
4.JB.15MagnussoniteMn2+10(As3+O3)6(OH,Cl)2Iso. m3m(4/m32/m) : Ia3d
4.JB.20ArmangiteMn2+26(AsO3)14(HAsO3)4(CO3)Trig. 3 : P3
4.JB.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14Trig. 3m(32/m) : R3m
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2Trig. 3m : P3c1
4.JB.35StenhuggariteCaFeSb(AsO3)2OTet. 4/mmm(4/m2/m2/m) : I41/amd
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)Mon. m
4.JB.45FinnemanitePb5(AsO3)3ClHex. 6/m : P63/m
4.JB.50GebharditePb8(As2O5)2OCl6Mon. 2/m : P21/b
4.JB.55GraeseriteFe3+4Ti3As3+O13(OH)Mon. 2/m : B2/m
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)Mon. 2/m : P21/m
4.JB.55DerbyliteFe3+4Ti3Sb3+O13(OH)Mon. 2/m : P21/m
4.JB.65FreediteCu+Pb8(AsO3)2O3Cl5Mon. 2/m : B2/m
4.JB.70GeorgiadesitePb4(As3+O3)Cl4(OH)Mon. 2/m : P21/b
4.JB.75Szklaryite◻Al6BAs3+3O15Orth. mmm(2/m2/m2/m) : Pbcm
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6Hex. 6mm : P63mc
4.JB.85LepageiteMn2+3(Fe3+7Fe2+4)O3[Sb3+5As3+8O34]Tric. 1 : P1
4.JB.90BianchiniiteBa2(TiV)(As2O5)2OFTet. 4/mmm(4/m2/m2/m) : I4/mcm

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 HemloiteHide

References for HemloiteHide

Localities for HemloiteHide

Showing 2 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.
Canada
 
  • Ontario
    • Thunder Bay District
      • Bomby Township
Harris et al. (1989) +1 other reference
Barrick Gold Corporation
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