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Grootfonteinite

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About GrootfonteiniteHide

Formula:
Pb3O(CO3)2
Colour:
colorless
Lustre:
Adamantine
Specific Gravity:
6.856 (Calculated)
Crystal System:
Hexagonal
Name:
Named after the Grootfontein district, that includes the type locality.
Structurally related to hydrocerussite and plumbonacrite. CHemically related to shannonite and UM1995-03-CO:Pb.


Classification of GrootfonteiniteHide

Approved
Approval Year:
2015
First Published:
2018

Physical Properties of GrootfonteiniteHide

Adamantine
Transparency:
Transparent
Colour:
colorless
Streak:
white
Tenacity:
Brittle
Cleavage:
Perfect
(0 0 1)
Parting:
Not observed
Fracture:
Irregular/Uneven
Density:
6.856 g/cm3 (Calculated)

Optical Data of GrootfonteiniteHide

Anisotropism:
Weak, ΔR(589nm)=2.1%, masked by internal reflections
Bireflectance:
Very weak
Colour in reflected light:
Grey
Internal Reflections:
White
Pleochroism:
Non-pleochroic

Chemical Properties of GrootfonteiniteHide

Formula:
Pb3O(CO3)2

Crystallography of GrootfonteiniteHide

Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P63mc
Cell Parameters:
a = 5.303(1) Å, c = 13.770(2) Å
Ratio:
a:c = 1 : 2.597
Unit Cell V:
334.88 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.353Å(9)
3.441Å(8)
3.244Å(100)
2.652Å(30)
2.627Å(12)
2.294Å(21)
2.267Å(5)
2.053Å(39)

Geological EnvironmentHide

Paragenetic Mode(s):
•  Oxidation

Type Occurrence of GrootfonteiniteHide

General Appearance of Type Material:
Platy grains up to 1 mm across and up to 0.2 mm thick
Place of Conservation of Type Material:
Cotype material is deposited in the mineralogical collections of the Swedish Museum of Natural History, Stockholm, Sweden, catalogue number 20080176
Associated Minerals at Type Locality:
Reference:
Siidra, O.I., Jonsson, E., Chukanov, N.V., Nekrasova, D.O., Pekov, I.V., Depmeier, W., Polekhovsky, Y.S., Yapaskurt, V.O. (2018) Grootfonteinite, Pb3O(CO3)2, a new mineral species from the Kombat Mine, Namibia, merotypically related to hydrocerussite. European Journal of Mineralogy: 30(2): 383-391.

Synonyms of GrootfonteiniteHide

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.

References for GrootfonteiniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Siidra, O.I., Jonsson, E., Chukanov, N.V., Pekov, I.V., Zinyakhina, D.O., Polekhovsky, Y.S. and Yapaskurt, V.O. (2015) Grootfonteinite, IMA 2015-051. CNMNC Newsletter No. 27, October 2015, page 1226. Mineralogical Magazine: 79: 1229–1236.
Siidra, O.I., Jonsson, E., Chukanov, N.V., Nekrasova, D.O., Pekov, I.V., Depmeier, W., Polekhovsky, Y.S., Yapaskurt, V.O. (2018) Grootfonteinite, Pb3O(CO3)2, a new mineral species from the Kombat Mine, Namibia, merotypically related to hydrocerussite. European Journal of Mineralogy: 30(2): 383-391.
Siidra, O., Nekrasova, D., Depmeier, W., Chukanov, N., Zaitsev, A., Turner, R. (2018) Hydrocerussite-related minerals and materials: structural principles, chemical variations and infrared spectroscopy. Acta Crystallgraphica: B74: 182-195.

Internet Links for GrootfonteiniteHide

Localities for GrootfonteiniteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Otjozondjupa Region
    • Grootfontein
      • Kombat
Siidra, O.I., Jonsson, E., Chukanov, N.V., Nekrasova, D.O., Pekov, I.V., Depmeier, W., Polekhovsky, Y.S., Yapaskurt, V.O. (2018) Grootfonteinite, Pb3O(CO3)2, a new mineral species from the Kombat Mine, Namibia, merotypically related to hydrocerussite. European Journal of Mineralogy: 30(2): 383-391.; Siidra, O.I., Jonsson, E., Chukanov, N.V.,Pekov,I.V.,Zinyakhina,D.O.,Polekhovsky, Y.S. and Yapaskurt, V.O. (2015) Grootfonteinite, IMA 2015-051. CNMNC Newsletter No. 27, October 2015, page 1226.
 
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