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Gelosaite

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About GelosaiteHide

Mario Gelosa
Formula:
BiMo6+(2-5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4)
Colour:
yellow, yellowish green, pale blue, colorless
Lustre:
Adamantine
Hardness:
3
Specific Gravity:
5.114 (Calculated)
Crystal System:
Monoclinic
Name:
After Mario Gelosa (1947–2006), an Italian mineral collector from Porto Torres, Sardinia, Italy.
Closely related to sardignaite.


Classification of GelosaiteHide

Approved
Approval Year:
2009
49.3.8.

49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen

Physical Properties of GelosaiteHide

Adamantine
Transparency:
Transparent
Colour:
yellow, yellowish green, pale blue, colorless
Streak:
white
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
5.114 g/cm3 (Calculated)

Optical Data of GelosaiteHide

Type:
Anisotropic
Bireflectance:
birefringent
Pleochroism:
Visible
Comments:
blue and pale blue
Comments:
on pale blue crystals

Chemical Properties of GelosaiteHide

Formula:
BiMo6+(2-5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4)
IMA Formula:
BiMo6+(2-5x)Mo5+6xO7(OH) · H2O (0 < x < 0.4)
Idealised Formula:
BiMo2+xO7(OH) · H2O

Crystallography of GelosaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 5.855(1) Å, b = 9.048(1) Å, c = 13.920(3) Å
β = 100.44(3)°
Ratio:
a:b:c = 0.647 : 1 : 1.538
Unit Cell V:
725.22 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Common - law unknown
Comment:
space group P21/n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.83(100)
3.41(21)
3.30(25)
3.015(50)
2.755(60)
2.080(50)
1.688(20)
1.509(30)

Type Occurrence of GelosaiteHide

General Appearance of Type Material:
It occurs as prismatic and very thin, elongated [010] and tabular {100} crystals up to 1 mm in length and a few micrometers in diameter
Place of Conservation of Type Material:
Museo di Storia Naturale e del Territorio of the University of Pisa, catalog number 18910.
Geological Setting of Type Material:
Gelosaite is a secondary mineral formed in the oxidation zone
Associated Minerals at Type Locality:

Synonyms of GelosaiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Molybdenite2 photos of Gelosaite associated with Molybdenite on mindat.org.
Quartz2 photos of Gelosaite associated with Quartz on mindat.org.
Bismuth1 photo of Gelosaite associated with Bismuth on mindat.org.
Anatase1 photo of Gelosaite associated with Anatase on mindat.org.
Ferrimolybdite1 photo of Gelosaite associated with Ferrimolybdite on mindat.org.

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 GelosaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Demartin, F., Orlandi, P., Pasero, M., Leverett, P., Williams, P., Hibbs, D. (2011) Gelosaite, BiMo6+(2−5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy and a second occurrence from Kingsgate, New England, Australia. American Mineralogist, 96(2-3), 268-273.

Internet Links for GelosaiteHide

Localities for GelosaiteHide

ⓘ - 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.
Australia
 
  • New South Wales
    • Gough Co.
      • Kingsgate
Orlandi, P., Demartin, F., Pasero, M., Leverett, P., Williams, P. A., & Hibbs, D. E. (2011). Gelosaite, BiMo6+ (2–5x) Mo5+ 6xO7 (OH)· H2O (0≤ x≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia. American Mineralogist, 96(2-3), 268-273. John Haupt collection
Orlandi, P., Demartin, F., Pasero, M., Leverett, P., Williams, P. A., & Hibbs, D. E. (2011). Gelosaite, BiMo6+ (2–5x) Mo5+ 6xO7 (OH)· H2O (0≤ x≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia. American Mineralogist, 96(2-3), 268-273.
Italy (TL)
 
  • Sardinia
    • Cagliari metropolitan city (Metropolitan City of Cagliari)
      • Sarroch
IMA Approvals - Sept. 2009; 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.; Demartin, F., Orlandi, P., Pasero, M., Leverett, P., Williams, P. A., Hibbs, D. E. (2011). Gelosaite, BiMo6+ (2–5x) Mo5+ 6xO7 (OH)· H2O (0≤ x≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia. American Mineralogist, 96, (2-3), 268-273.
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