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Chongite

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About ChongiteHide

Formula:
Ca3Mg2(AsO4)2(AsO3OH)2·4H2O
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.09
Crystal System:
Monoclinic
Name:
Honours Dr. Guillermo Chong Díaz (born 1936). Dr. Chong is a prominent Chilean geologist and academician whose research has largely focused on the Atacama Desert. During his approximately 50-year career, he has some 250 publications and meeting presentations, including serving as lead author for the chapter on Industrial Minerals and Rocks in The Geology of Chile published by the Geological Society of London in 2007. Dr. Chong is currently a professor in the Department of Geological Sciences at Universidad Católica del Norte in Antofagasta, Chile.
The Mg analogue of sainfeldite. Chemically related to irhtemite and picropharmacolite; also similar to adelite, camgasite, talmessite, and wendwilsonite.

See also UM1997-09-AsO:CaHMgZn which is probably identical to chongite.


Classification of ChongiteHide

Approved
Approval Year:
2015
First Published:
2016

Physical Properties of ChongiteHide

Vitreous
Transparency:
Transparent
Streak:
white
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {100}
Fracture:
Conchoidal
Density:
3.09 g/cm3 (Measured)    3.087 g/cm3 (Calculated)

Optical Data of ChongiteHide

Type:
Biaxial (-)
RI values:
nα = 1.612(1) nβ = 1.626(1) nγ = 1.635(1)
2V:
Measured: 76.9° , Calculated: 76.9°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r & lt; v, distinct
Pleochroism:
Non-pleochroic

Chemical Properties of ChongiteHide

Formula:
Ca3Mg2(AsO4)2(AsO3OH)2·4H2O
IMA Formula:
Ca3Mg2(AsO4)2(AsO3OH)2 · 4H2O
Common Impurities:
Mn

Crystallography of ChongiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 18.5879(6) Å, b = 9.3660(3) Å, c = 9.9622(7) Å
β = 96.916(7)°
Ratio:
a:b:c = 1.985 : 1 : 1.064
Unit Cell V:
1721.75 ų
Z:
4
Morphology:
Prismatic crystals; tightly intergrown radial aggregates

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.35(29)
4.644(62)
4.396(26)
3.372(62)
3.275(100)
3.113(57)
2.384(30)
1.799(22)

Type Occurrence of ChongiteHide

General Appearance of Type Material:
Prismatic crystals to about 1 mm in length grouped in tightly intergrown radial aggregates to about 2 mm in diameter
Place of Conservation of Type Material:
Co-type material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 65585, 65586 and 65587
Geological Setting of Type Material:
Veins rich in secondary arsenic and copper minerals that intersect metamorphosed marine shales and lavas. Formed from the oxidation of native arsenic and other As-bearing primary phases, followed by later alteration by saline fluids derived from evaporating meteoric water under hyperarid conditions.
Associated Minerals at Type Locality:

Synonyms of ChongiteHide

Relationship of Chongite to other SpeciesHide

Other Members of this group:
GiftgrubeiteCaMn2Ca2(AsO4)2(AsO3OH)2·4H2OMon. 2/m : B2/b
Hureaulite(Mn,Fe)5(PO4)2(HPO4)2 · 4H2OMon. 2/m : B2/b
MiguelromeroiteMnMn2Mn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
NyholmiteCd3Zn2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
SainfelditeCa5(AsO4)2(AsO3OH)2 · 4H2OMon. 2/m : B2/b
VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b

Other InformationHide

Notes:
Slowly soluble in dilute HCl at room temperature.
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 ChongiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Nash, B., Dini, M. and Molina Donoso, A.A. (2015) Chongite, IMA 2015-039. CNMNC Newsletter No. 26, August 2015, page 946; Mineralogical Magazine, 79, 941-947.
Kampf, A.R., Nash, B.P., Dini, M., Molina Donoso, A.A. (2016): Chongite, Ca3Mg2(AsO4)2(AsO3OH)2·4H2O, a new arsenate member of the hureaulite group from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine: 80: 1255-1263.

Internet Links for ChongiteHide

Localities for ChongiteHide

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)
 
  • Tarapacá Region
    • Iquique Province
      • Salar Grande
Kampf, A.R., Nash, B., Dini, M. and Molina Donoso, A.A. (2015) Chongite, IMA 2015-039. CNMNC Newsletter No. 26, August 2015, page 946; Mineralogical Magazine, 79, 941-947; Kampf, A.R., Nash, B.P., Dini, M., Molina Donoso, A.A. (2016): Chongite, Ca3Mg2(AsO4)2(AsO3OH)2·4H2O, a new arsenate member of the hureaulite group from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine: 80: 1255-1263
Czech Republic
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
Kampf, A.R., Nash, B.P., Dini, M., Molina Donoso, A.A. (2016): Chongite, Ca3Mg2(AsO4)2(AsO3OH)2·4H2O, a new arsenate member of the hureaulite group from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine: 80: 1255-1263. [see https://www.mindat.org/min-7653.html]
Mineral and/or Locality  
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