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Ichnusaite

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Formula:
Th(MoO4)2·3H2O
System:
Monoclinic
Colour:
Colorless
Name:
The name is from the old Greek name of Sardinia, Ιχνουσσα, ichnusa.
New structure type. (pronounced iknusa-ait)

Classification of Ichnusaite

Approved
Approval Year:
2013
mindat.org URL:
http://www.mindat.org/min-45998.html
Please feel free to link to this page.

Type Occurrence of Ichnusaite

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:

Physical Properties of Ichnusaite

Adamantine, Pearly
Diaphaneity (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

Crystallography of Ichnusaite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Space Group 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 Volume:
V 942 ų
Z:
4
Morphology:
Thin {100} tabular crystals
X-Ray 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.

Chemical Properties of Ichnusaite

Formula:
Th(MoO4)2·3H2O
All elements listed in formula:
Analytical Data:
Electron microprobe analysis
MoO3(47.86)(1.43)
ThO2(43.40)(79)
total 91.26(87)
Empirical Formula:
Th0.99Mo2.01O8·3H2O

Other Names for Ichnusaite

Name in Other Languages:

Other Information

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 Ichnusaite

Reference List:
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., 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 Ichnusaite

Localities for Ichnusaite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy (TL)
 
  • Sardinia
    • Cagliari Province
      • 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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