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Dusmatovite

A valid IMA mineral species
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02788750017271928556328.jpg
Dusmatovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
06823210017271928574711.jpg
Dusmatovite

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
04714870017271928614331.jpg
Dusmatovite

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
04396710017866427946729.jpg
Dusmatovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
06823210017271928574711.jpg
Dusmatovite

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
04714870017271928614331.jpg
Dusmatovite

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
06909080017271928656871.jpg
Dusmatovite, etc.

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
06823210017271928574711.jpg
Dusmatovite

Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
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About DusmatoviteHide

09477950017271928686306.jpg
Tajik geologist and mineralogist Vyacheslav Djuraevitch Dusmatov.
Formula:
K(K◻)Mn2+2Zn3[Si12O30]
IMA formula given for dusmatovite is actually close to the correct formula for darapiosite (but with 2K in the B site rather than 2Na). However, this formula appears to be in error in several respects (both in the B and T2 site occupancies). The correct T2 site Li-free (all Zn) and B site (K+◻) end-member formula is given in Gagné & Hawthorne (2016).
Colour:
Dark blue, dirty blue, violet-brown
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
2.96
Crystal System:
Hexagonal
Member of:
Osumilite Group
Name:
For Vyacheslav Djuraevitch Dusmatov (1936-2004), Mineralogist and geologist who has done much work at the locality.
The Zn-dominant analogue of darapiosite. Unique combination of elements (2024).

Dusmatovite differs from darapiosite in the dominance of Zn at the T2 site. Zn dominates over both Li and Mn.


Unique IdentifiersHide

Mindat ID:
6906
Long-form identifier:
mindat:1:1:6906:5

IMA Classification of DusmatoviteHide

Classification of DusmatoviteHide

Strunz-mindat (2026):
9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
Dana 8th ed.:
63.2.1a.11

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)

Mineral SymbolsHide

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

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference for Standard
DusIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
DusThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of DusmatoviteHide

Lustre:
Vitreous
Transparency:
Translucent
Colour:
Dark blue, dirty blue, violet-brown
Streak:
Light blue
Hardness:
4½ on Mohs scale
Hardness:
VHN100=423 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
Basal
Density:
2.96(2) g/cm3 (Measured)    2.978 g/cm3 (Calculated)

Optical Data of DusmatoviteHide

Type:
Uniaxial (-)
RI values:
nω = 1.59 nε = 1.586
Max. Birefringence:
δ = 0.004
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.

Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
light blue (E), light violet (O)

Chemistry of DusmatoviteHide

Mindat Formula:
K(K◻)Mn2+2Zn3[Si12O30]

IMA formula given for dusmatovite is actually close to the correct formula for darapiosite (but with 2K in the B site rather than 2Na). However, this formula appears to be in error in several respects (both in the B and T2 site occupancies). The correct T2 site Li-free (all Zn) and B site (K+◻) end-member formula is given in Gagné & Hawthorne (2016).
Element Weights:
Element% weight
O39.958 %
Si28.057 %
Zn16.328 %
Mn9.147 %
K6.510 %

Calculated from ideal end-member formula.
Elements listed:
K, Mn, O, Si, Zn - search for minerals with similar chemistry
Common Impurities:
Li,Y,Mn(III),Zr,Fe

Crystallography of DusmatoviteHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm(6/m2/m2/m) - Dihexagonal Dipyramidal
Space Group:
P6/mcc
Cell Parameters:
a = 10.218(4) Å, c = 14.292(3) Å
Ratio:
a:c = 1 : 1.399
Unit Cell V:
1,292.28 ų (Calculated from Unit Cell)
Morphology:
grains in aggregates

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of DusmatoviteHide

Type Locality:
ⓘ Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan
General Appearance of Type Material:
Grains, in aggregates up to 4 x 5 cm.
Place of Conservation of Type Material:
Museum of the Ilmen State Preserve, Miass, Russia.
Geological Setting of Type Material:
Boulder of pegmatite in a glacial moraine.
Associated Minerals at Type Locality:
AegirineHyalotekiteKupletskite-(Cs)MicroclinePolylithionite
Quartz
Reference:
Pautov, L.A., Agakhanov, A.A., Sokolova, E.V., Ignatenko, K.I. (1996) Dusmatovite, a new mineral of the milarite group. Vestnik Moskovskogo Universiteta, Geologiya: 4: 54-60.

Synonyms of DusmatoviteHide

Other Language Names for DusmatoviteHide

German:Dusmatovit
Simplified Chinese:锰锌大隅石
Spanish:Dusmatovita
Traditional Chinese:錳鋅大隅石

Relationship of Dusmatovite to other SpeciesHide

Member of:
Osumilite Group
Other Members of Osumilite Group:
Agakhanovite-(Y)K◻2(YCa)Be3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
AlmaruditeK◻2Mn2+2(Be2Al)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mmm
AluminosugiliteKNa2Al2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
ArmeniteBa(H2O)2Ca2Al3[Al3Si9O30]Orth. mmm(2/m2/m2/m) : Pnna
BerezanskiteK◻2Ti2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
BrannockiteK◻2Sn2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
ChayesiteK◻2Mg2(Mg2Fe3+)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
DarapiositeKNa2Mn2(Zn2Li)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
EifeliteKNa2(MgNa)Mg3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
FriedrichbeckeiteK(◻Na)Mg2(Be2Mg)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
KlöchiteK◻2(Fe2+Fe3+)Zn3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P63/mmc
LaurentthomasiteK◻2Mg2(Be2Al)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
MerrihueiteK(◻Na)Fe2+2Fe2+3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
MilariteK(◻H2O)Ca2(Be2Al)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
OftedaliteK◻2(ScCa)Be3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
OsumiliteK◻2Fe2+2Al3[Al2Si10O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
Osumilite-(Mg)K◻2Mg2Al3[Al2Si10O30] Hex. 6/mmm(6/m2/m2/m) : P6/mcc
PlechoviteCa2[K(H2O)]KBe3Si12O30Hex. 6/mmm(6/m2/m2/m) : P6/mcc
PoudretteiteK◻2Na2B3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
RoedderiteK(◻Na)Mg2Mg3[Si12O30]Hex. 6m2 : P62c
ShibkoviteK(◻K)Ca2Zn3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
SogdianiteK◻2Zr2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
SugiliteKNa2Fe3+2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
Trattnerite◻(◻)2Fe3+2Mg3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
'UM1990-73-SiO:KMnNaZn'K(KNa0.5◻0.5)(Mn1.5Na0.5)Zn3[Si12O30]Hex.
'Unnamed (Mn3+-dominant analog of Sugilite)'KNa2Mn3+2Li3[Si12O30]
YagiiteNa◻2Mg2Al3[Al2Si10O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc

Common AssociatesHide

Associations Based on Photo Data:
1 photo of Dusmatovite associated with Kupletskite-(Cs)Cs2NaMn2+7Ti2[Si4O12]2O2(OH)4F
1 photo of Dusmatovite associated with AegirineNaFe3+Si2O6

Related Minerals - Strunz-mindat GroupingHide

9.CM.Agakhanovite-(Y)K◻2(YCa)Be3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.PlechoviteCa2[K(H2O)]KBe3Si12O30Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05FriedrichbeckeiteK(◻Na)Mg2(Be2Mg)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05LaurentthomasiteK◻2Mg2(Be2Al)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05'UM1990-73-SiO:KMnNaZn'K(KNa0.5◻0.5)(Mn1.5Na0.5)Zn3[Si12O30]Hex.
9.CM.05EifeliteKNa2(MgNa)Mg3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05AlmaruditeK◻2Mn2+2(Be2Al)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mmm
9.CM.05ArmeniteBa(H2O)2Ca2Al3[Al3Si9O30]Orth. mmm(2/m2/m2/m) : Pnna
9.CM.05MerrihueiteK(◻Na)Fe2+2Fe2+3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05OftedaliteK◻2(ScCa)Be3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05RoedderiteK(◻Na)Mg2Mg3[Si12O30]Hex. 6m2 : P62c
9.CM.05ShibkoviteK(◻K)Ca2Zn3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05SogdianiteK◻2Zr2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05MilariteK(◻H2O)Ca2(Be2Al)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05BerezanskiteK◻2Ti2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05PoudretteiteK◻2Na2B3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05DarapiositeKNa2Mn2(Zn2Li)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05ChayesiteK◻2Mg2(Mg2Fe3+)[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05Osumilite-(Mg)K◻2Mg2Al3[Al2Si10O30] Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05OsumiliteK◻2Fe2+2Al3[Al2Si10O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05SugiliteKNa2Fe3+2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05Trattnerite◻(◻)2Fe3+2Mg3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05BrannockiteK◻2Sn2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.05KlöchiteK◻2(Fe2+Fe3+)Zn3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P63/mmc
9.CM.05YagiiteNa◻2Mg2Al3[Al2Si10O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.9.CM.AluminosugiliteKNa2Al2Li3[Si12O30]Hex. 6/mmm(6/m2/m2/m) : P6/mcc
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[Si6O18]2[Si12O30]F2Tric. 1 : P1

RadioactivityHide

Radioactivity:
Element % Content Activity (Bq/kg) Radiation Type
Uranium (U) 0.0000% 0 α, β, γ
Thorium (Th) 0.0000% 0 α, β, γ
Potassium (K) 6.5098% 2,018 β, γ

For comparison:

  • Banana: ~15 Bq per fruit
  • Granite: 1,000–3,000 Bq/kg
  • EU exemption limit: 10,000 Bq/kg

Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.

Interactive Simulator:

Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!

Activity: –

DistanceDose rateRisk
1 cm
10 cm
1 m

The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).

D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield

Other InformationHide

IR Spectrum:
1030 cm-1 (Si-O), 795cm-1 (ring silicate)
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 DusmatoviteHide

References for DusmatoviteHide

Localities for DusmatoviteHide

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.
Tajikistan (TL)
 
  • Districts of Republican Subordination
Sokolova et al. (1995) +3 other references
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