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Demagistrisite

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Formula:
BaCa2Mn3+4(Si3O10)(Si2O7)(OH)4·3H2O
Crystal System:
Orthorhombic
New structure type. Chemically somewhat related to various mineral species, e.g., the unapproved 'bariumbannisterite' or muirite.


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Classification of DemagistrisiteHide

Approved, Pending publication
Approval Year:
2018

Chemical Properties of DemagistrisiteHide

Formula:
BaCa2Mn3+4(Si3O10)(Si2O7)(OH)4·3H2O

Crystallography of DemagistrisiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Amm2
Cell Parameters:
a = 16.3160(6) Å, b = 6.1830(2) Å, c = 9.0740(3) Å
Ratio:
a:b:c = 2.639 : 1 : 1.468
Unit Cell V:
915.40 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
16.21(49)
4.86(44)
4.34(56)
3.196(43)
2.871(54)
2.731(100)
2.671(74)
2.426(51)
Comments:
From Type Description.

Type Occurrence of DemagistrisiteHide

Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Museum of the Earth Sciences Department, Università di Milano, Via Mangiagalli 34, 20133 Milano, Italy, registration number MCMGPG-H2018-004 (holotype), and the Natural History Museum of L

Synonyms of DemagistrisiteHide

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 DemagistrisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Cámara, F., Nestola, F., Ciriotti, M.E. and Balestra, C. (2018) Demagistrisite, IMA 2018-059. CNMNC Newsletter No. 45, October 2018: page xxx; Mineralogical Magazine: 82: xxx-xxx.

Internet Links for DemagistrisiteHide

Localities for DemagistrisiteHide

ⓘ - 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.
Italy (TL)
 
  • Liguria
    • La Spezia Province
      • Vara Valley
        • Borghetto Vara
Kampf, A.R., Cámara, F., Nestola, F., Ciriotti, M.E. and Balestra, C. (2018) Demagistrisite, IMA 2018-059. CNMNC Newsletter No. 45, October 2018, page xxx; Mineralogical Magazine, 82, xxx-xxx.
Mineral and/or Locality  
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