Gelosaite
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About Gelosaite
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.
Classification of Gelosaite
Approved
Approval Year:
2009
49.3.8.
49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
49 : HYDRATED MOLYBDATES AND TUNGSTATES
3 : Hydrated Molybdates and Tungstates Containing Hydroxyl or Halogen
Physical Properties of Gelosaite
Adamantine
Transparency:
Transparent
Colour:
yellow, yellowish green, pale blue, colorless
Streak:
white
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
5.114 g/cm3 (Calculated)
Optical Data of Gelosaite
Type:
Anisotropic
Bireflectance:
birefringent
Pleochroism:
Visible
Comments:
blue and pale blue
Comments:
on pale blue crystals
Chemical Properties of Gelosaite
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
Elements listed:
Crystallography of Gelosaite
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)°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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 Gelosaite
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 Gelosaite
Common Associates
Associated Minerals Based on Photo Data:
| Molybdenite | 2 photos of Gelosaite associated with Molybdenite on mindat.org. |
| Quartz | 2 photos of Gelosaite associated with Quartz on mindat.org. |
| Bismuth | 1 photo of Gelosaite associated with Bismuth on mindat.org. |
| Anatase | 1 photo of Gelosaite associated with Anatase on mindat.org. |
| Ferrimolybdite | 1 photo of Gelosaite associated with Ferrimolybdite on mindat.org. |
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 Gelosaite
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 Gelosaite
mindat.org URL:
https://www.mindat.org/min-39660.html
Please feel free to link to this page.
Please feel free to link to this page.
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Localities for Gelosaite
ⓘ - 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.
- 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| 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) | |
| 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. |
Old 25 Pipe, Kingsgate, Gough Co., New South Wales, Australia