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Ichnusaite

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About IchnusaiteHide

Sardinia, Italy
Formula:
Th(MoO4)2·3H2O
Colour:
Colorless
Lustre:
Adamantine, Pearly
Specific Gravity:
4.262 (Calculated)
Crystal System:
Monoclinic
Name:
The name is from the old Greek name of Sardinia, Ιχνουσσα, ichnusa.
New structure type. (pronounced iknusa-ait)


Classification of IchnusaiteHide

Approved
Approval Year:
2013
First Published:
2014

Physical Properties of IchnusaiteHide

Adamantine, Pearly
Transparency:
Transparent
Colour:
Colorless
Streak:
white
Tenacity:
Brittle
Cleavage:
Perfect
{100}
Density:
4.262 g/cm3 (Calculated)
Comment:
Could not be measured on type material

Chemical Properties of IchnusaiteHide

Formula:
Th(MoO4)2·3H2O
IMA Formula:
Th(MoO4)2 · 3H2O

Crystallography of IchnusaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.6797(12) Å, b = 10.3771(13) Å, c = 9.3782(12) Å
β = 90.00(1)°
Ratio:
a:b:c = 0.933 : 1 : 0.904
Unit Cell V:
942 ų
Z:
4
Morphology:
Thin {100} tabular crystals

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.7(mw)
5.66(m)
5.19(mw)
4.69(mw)
3.930(m)
3.479(s)
3.257(s)
3.074(m)
Comments:
From Type Description.

Type Occurrence of IchnusaiteHide

General Appearance of Type Material:
Thin {100} tabular crystals, up to 200 μm in length
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo di Storia Naturale, Universita` di Pisa, Calci (Pisa), Italy, catalogue number 19679
Geological Setting of Type Material:
Alteration of molybdenite ores under basic pH conditions.
Associated Minerals at Type Locality:
Reference:
Orlandi, P., Biagioni, C., Bindi, L., Nestola, F. (2014) Ichnusaite, Th(MoO4)2·3H2O, the first natural thorium molybdate: occurrence, description, and crystal structure. American Mineralogist: 99: 2089-2094.

Synonyms of IchnusaiteHide

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 IchnusaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Orlandi, P., Biagioni, C., Bindi, L., Nestola, F. (2013) Ichnusaite, IMA 2013- 087. CNMNC Newsletter No. 18, December 2013, page 3255; Mineralogical Magazine: 77: 3249-3258.
Orlandi, P., Biagioni, C., Bindi, L., Nestola, F. (2014) Ichnusaite, Th(MoO4)2·3H2O, the first natural thorium molybdate: occurrence, description, and crystal structure. American Mineralogist: 99: 2089-2094.

Internet Links for IchnusaiteHide

Localities for IchnusaiteHide

ⓘ - 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)
 
  • Sardinia
    • Cagliari metropolitan city (Metropolitan City of Cagliari)
      • Sarroch
Orlandi, P., Biagioni, C., Bindi, L. and Nestola, F. (2013) Ichnusaite, IMA 2013- 087. CNMNC Newsletter No. 18, December 2013, page 3255; Mineralogical Magazine, 77, 3249-3258. ; Orlandi P., Gelosa M., Bonacina E., Caboni F., Mamberti M., Tanca G.A., Vinci A. (2015): Sette nuove specie mineralogiche della Sardegna. I minerali della mineralizzazione a molibdeno e bismuto di Su Seinargiu (CA). Riv. Mineral. Ital., 39, 2, 84-115.
Mineral and/or Locality  
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