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⇱ Paramolybdomenite: Mineral information, data and localities.

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Paramolybdomenite

A valid IMA mineral species - pending publication
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About ParamolybdomeniteHide

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Formula:
PbSeO3
Colour:
bright yellow
Lustre:
Adamantine
Specific Gravity:
6.743 (Calculated)
Crystal System:
Monoclinic
Name:
It was named paramolybdomenite (Cyrillic: парамолибдоменит) due to the dimorphism with molybdomenite, which name originates from the Greek μόλυβδος for "lead" and μήυη for "moon", because the chemical element selenium is named for the moon.
Dimorph of:
Paramolybdomenite is a natural analogue of synthetic α-PbSeO3.

In the structure of paramolybdomenite the [Pb2+O9] polyhedra are cross-connected via common edges and are connected via common corners with [Se4+O3] groups to form a quasiframework. Selenium atoms occupy two crystallographically independent sites; the Se1 site is occupied only with Se4+, whereas Se2 has the mixed Se/S population [substitution of (SeO3)2–for (SO4)2–]

Paramolybdomenite is represented in nature, as it is known now, by two chemical varieties: S-enriched one, containing up to 6.4 wt.% SO3 (from the type locality: Tolbachik), and S-free, corresponding to the end-member (the second occurrence: El Dragón Mine).


Unique IdentifiersHide

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Mindat ID:
470834
Long-form identifier:
mindat:1:1:470834:2

IMA Classification of ParamolybdomeniteHide

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Approved, Pending publication
Approval year:
2023
Approval history:
IMA No. 2023-025

Classification of ParamolybdomeniteHide

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4.JF.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
F : Selenites without additional anions, without H2O

Mineral SymbolsHide

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

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

Physical Properties of ParamolybdomeniteHide

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Adamantine
Transparency:
Transparent
Colour:
Bright yellow
Streak:
Yellowish
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Irregular/Uneven
Density:
6.743 g/cm3 (Calculated)

Chemistry of ParamolybdomeniteHide

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Mindat Formula:
PbSeO3
Element Weights:
Element% weight
Pb62.007 %
Se23.630 %
O14.364 %

Calculated from ideal end-member formula.
Common Impurities:
S

Crystallography of ParamolybdomeniteHide

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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.997(1) Å, b = 8.159(1) Å, c = 9.032(1) Å
β = 103.33(1)°
Ratio:
a:b:c = 1.103 : 1 : 1.107
Unit Cell V:
645.15 ų (Calculated from Unit Cell)
Z:
8

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
3.823 Å(17)
3.534 Å(34)
3.293 Å(100)
3.244 Å(63)
2.997 Å(35)
2.981 Å(36)
2.788 Å(49)
2.760 Å(26)

Type Occurrence of ParamolybdomeniteHide

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General Appearance of Type Material:
tabular to lamellar crystals up to 0.1 × 0.05 × 0.01 mm and their clusters up to 0.15 mm

The crystals demonstrate different signs of the skeletal growth: they are surrounded by fringed aggregates of acicular or columnar tiny subindividuals grown on lateral faces and are typically cavernous, "waffle-like"
Place of Conservation of Type Material:
collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 6007/1
Geological Setting of Type Material:
it is a supergene mineral formed in the weathering zone of the deposits of volcanic fumaroles extinct for a long time.
Associated Minerals at Type Locality:

Other Language Names for ParamolybdomeniteHide

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Related Minerals - Strunz-mindat GroupingHide

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4.JF.05MolybdomenitePbSeO3Mon. 2/m : P21/m

Other InformationHide

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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 ParamolybdomeniteHide

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mindat.org URL:
https://www.mindat.org/min-470834.html
Please feel free to link to this page.

References for ParamolybdomeniteHide

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Localities for ParamolybdomeniteHide

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Showing 2 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
Bolivia
  • Potosí
    • Antonio Quijarro Province
      • Porco Municipality
Pekov et al. (2025)
Russia (TL)
  • Kamchatka Krai
    • Milkovsky District
      • Tolbachik Volcanic field
        • Mountain 1004
Bosi et al. (2023) +1 other reference
Quick NavTopAbout ParamolybdomeniteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Chemistry Crystallography X-Ray Powder DiffractionType Occurrence Other LanguagesStrunz-MindatOther InformationInternet Links References Localities Locality List
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