Mendipite (original) (raw)
A valid IMA mineral species - grandfathered
About MendipiteHide
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Colour:
Colourless, white, grey, often tinged yellow, blue, red; nearly colourless in transmitted light
Lustre:
Adamantine, Resinous, Silky, Pearly
Crystal System:
Orthorhombic
Name:
After the type locality at the Mendip Hills, Somerset, England, UK.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2641:9
IMA Classification of MendipiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
Classification of MendipiteHide
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3.DC.70
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
10.3.1.1
10 : OXYHALIDES AND HYDROXYHALIDES
3 : A3(O,OH)2Xq
8.8.5
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
8 : Halides of Pb
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.
| Symbol | Source | Reference |
|---|---|---|
| Mdi | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of MendipiteHide
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Adamantine, Resinous, Silky, Pearly
Transparency:
Transparent, Translucent
Colour:
Colourless, white, grey, often tinged yellow, blue, red; nearly colourless in transmitted light
Cleavage:
Perfect
On {110} perfect; {100} and {010} less perfect.
Fracture:
Irregular/Uneven, Conchoidal
Density:
7.24 g/cm3 (Measured) 7.22 g/cm3 (Calculated)
Optical Data of MendipiteHide
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RI values:
_n_α = 2.240 _n_β = 2.270 _n_γ = 2.310
2V:
Measured: 90° , Calculated: 84°
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Dispersion:
relatively strong
Optical Extinction:
Parallel. X = a; Y = b; Z = c.
Chemistry of MendipiteHide
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Crystallography of MendipiteHide
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Crystal System:
Orthorhombic
Class (H-M):
222 - Disphenoidal
Cell Parameters:
a = 9.52 Å, b = 11.87 Å, c = 5.87 Å
Ratio:
a:b:c = 0.802 : 1 : 0.495
Unit Cell V:
663.32 ų (Calculated from Unit Cell)
Morphology:
Fibrous or columnar masses, often radiated.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0006898 | Mendipite | Krivovichev S V, Burns P C (2001) Crystal chemistry of lead oxide chlorides. I. Crystal structures of synthetic mendipite, Pb3O2Cl2, and synthetic damaraite, Pb3O2(OH)Cl European Journal of Mineralogy 13 801-809 | 2001 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.40 Å | (60) |
| 3.78 Å | (60) |
| 3.51 Å | (70) |
| 3.08 Å | (60) |
| 3.04 Å | (80) |
| 2.78 Å | (100) |
| 2.64 Å | (90) |
Comments:
Låangban, Sweden.
Geological EnvironmentHide
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Type Occurrence of MendipiteHide
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General Appearance of Type Material:
Radiating masses of pale straw-yellow prismatic crystals and cleavages.
Associated Minerals at Type Locality:
Synonyms of MendipiteHide
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Other Language Names for MendipiteHide
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Simplified Chinese:白氯铅矿
Traditional Chinese:白氯鉛礦
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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Thermal Behaviour:
Before the the blowpipe, decrepitates slightly and is easily melted. After cooling the globule is yellow. On charcoal, it is reduced and emits fumes of muriatic acid. With peroxide of copper and salt of phosphorous, the oxidizing flame is colored intense blue.
Notes:
Soluble in dilute nitric acid.
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 MendipiteHide
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References for MendipiteHide
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Reference List:
Alun Humphreys, D., Thomas, John H., Williams, Peter A., Symes, Robert F. (1980) The chemical stability of mendipite, diaboleïte, chloroxiphite, and cumengéite, and their relationships to other secondary lead(II) minerals. Mineralogical Magazine, 43 (331) 901-904 doi:10.1180/minmag.1980.043.331.13
Localities for MendipiteHide
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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
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- 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.