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Mejillonesite

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About MejillonesiteHide

Formula:
HNaMg2(HPO4)(PO4)(OH) · 2H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.36(1)
Crystal System:
Orthorhombic
Name:
Named by Daniel Atencio, et al. in 2012 for the type locality of Cerro Mejillones.
This page provides mineralogical data about Mejillonesite.


Classification of MejillonesiteHide

Approved
Approval Year:
2011
First Published:
2012
8.D0.

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
0 :

Physical Properties of MejillonesiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {100}, good on {010} and {001}.
Parting:
Not observed.
Fracture:
Step-Like
Density:
2.36(1) g/cm3 (Measured)    2.367 g/cm3 (Calculated)
Comment:
Measured in heavy liquids

Optical Data of MejillonesiteHide

Type:
Biaxial (-)
RI values:
nα = 1.507 nβ = 1.531
Max Birefringence:
δ = 1.507
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of MejillonesiteHide

Formula:
HNaMg2(HPO4)(PO4)(OH) · 2H2O
IMA Formula:
NaMg2(PO3OH)(PO4)(OH) · H5O2

Crystallography of MejillonesiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 16.295(1) Å, b = 13.001(2) Å, c = 8.434(1) Å
Ratio:
a:b:c = 1.253 : 1 : 0.649
Unit Cell V:
1,786.75 ų (Calculated from Unit Cell)
Morphology:
The dominant form is the pinacoid {100}.
Prisms {hk0}, {h0l}, and {0kl} also observed.
Twinning:
None observed.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.095 (100)
6.846 (9)
6.470 (8)
3.317 (5)
2.959 (5)
2.706 (12)
2.157 (19)
2.153 (9)

Type Occurrence of MejillonesiteHide

General Appearance of Type Material:
Prismatic and elongated thick tabular crystals up to 6 mm long, usually intergrown in
radiating aggregates.
Place of Conservation of Type Material:
Museu de Geociências, Instituto de Geociências, Universidade de São Paulo, São Paulo (Brazil), catalogue no. DR712.
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow (Russia), registration no. 4043/1.
Geological Setting of Type Material:
Contact between a granite and what is now a fine-grained, completely altered siliceous layer at the base of a Pliocene (ca. 2.5 Ma) coastal bird guano deposit.
Associated Minerals at Type Locality:

Synonyms of MejillonesiteHide

Fluorescence of MejillonesiteHide

Short wave UV - None
Long wave UV - None

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 MejillonesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Atencio, D., Chukanov, N.V., Nestola, F., Witzke, T., Coutinho, J.M.V., Zadov, A.E., Contreira Filho, R.R., Färber, G. (2011) Mejillonesite, IMA 2010-068. CNMNC Newsletter 8, 291; Mineralogical Magazine 75, 289-294.
Atencio, D., Chukanov, N.V., Nestola, F., Witzke, T., Coutinho, J.M.V., Zadov A.E., Contreira Filho, R.R., Färber, G. (2012) Mejillonesite, a new acid sodium, magnesium phosphate mineral, from Mejillones, Antofagasta, Chile. American Mineralogist: 97: 19-25.
Kampf, A.R., Mills, S.J., Housley, R.M., Favreau, G., Boulliard, J.C., Bourgoin, V. (2012) Angarfite, NaFe3+5(PO4)4(OH)4·4H2O, a new mineral species from the Angarf-Sud pegmatite, Morocco: description and crystal structure. The Canadian Mineralogist: 50: 781-791.
Tait, K.T., Belakovskiy, D., Welch, M.D., Gatta, G.D., Cámara, F. (2012) New mineral names. American Mineralogist: 97: 1260-1265.

Internet Links for MejillonesiteHide

Localities for MejillonesiteHide

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.
Chile (TL)
 
  • Antofagasta Region
    • Antofagasta Province
      • Mejillones
        • Mejillones peninsula
Atencio, D., Chukanov, N.V., Nestola, F., Witzke, T., M.V. Coutinho, J.M.V., Zadov, A.E., Contreira Filho, R.R. and Färber, G. (2011): CNMNC Newsletter 8, 291; Atencio, D., Chukanov, N. V., Nestola, F., Witzke, T., Coutinho, J. M., Zadov, A. E., ... & Färber, G. (2012). Mejillonesite, a new acid sodium, magnesium phosphate mineral, from Mejillones, Antofagasta, Chile. American Mineralogist, 97(1), 19-25.
Poland
 
  • Silesia
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Ł. Kruszewski PXRD data (to be published soon)
Mineral and/or Locality  
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