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Rossiantonite

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Formula:
Al3(PO4)(SO4)2(OH)2(H2O)14
Colour:
colorless
Lustre:
Vitreous
Specific Gravity:
1.958 (Calculated)
Crystal System:
Triclinic
Name:
Named after Antonio Rossi (1942–2011), professor of Sedimentary Petrology at Modena and Reggio Emilia University and an early developer of scientific speleology in Italy, in recognition of his constant and precious efforts devoted to the study of minerals and, especially, of cave minerals.
New structure type.
Structurally similar to the Sanjuanite-Destinezite Group.


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Classification of RossiantoniteHide

Approved

Physical Properties of RossiantoniteHide

Vitreous
Transparency:
Transparent
Colour:
colorless
Streak:
white
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
1.958 g/cm3 (Calculated)

Optical Data of RossiantoniteHide

Type:
Biaxial
Pleochroism:
Non-pleochroic
Comments:
mean refractive index of n = 1.504.
interference colors vary from light gray to light cyan.

Chemical Properties of RossiantoniteHide

Formula:
Al3(PO4)(SO4)2(OH)2(H2O)14
IMA Formula:
Al3(PO4)(SO4)2(OH)2(H2O)10 · 4H2O

Crystallography of RossiantoniteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 10.3415(5) Å, b = 10.9580(5) Å, c = 11.1445(5) Å
α = 86.968(2)°, β = 65.757(2)°, γ = 75.055(2)°
Ratio:
a:b:c = 0.944 : 1 : 1.017
Unit Cell V:
1,110.58 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.16(32)
9.12(56)
8.02(40)
7.12(33)
5.00(29)
4.647(100)
4.006(53)
3.781(28)
Comments:
From Type Description.

Type Occurrence of RossiantoniteHide

General Appearance of Type Material:
Sand like grains on floor of cave with prismatic euhedral crystals, ~0.15 mm in size
Place of Conservation of Type Material:
Gemma University Museum of Modena and Reggio E. University, Modena, Italy, catalogue number 2/2012
Geological Setting of Type Material:
Precambrian quartz sandstone under tropical wet conditions, in Venezuela, cave environment.
Associated Minerals at Type Locality:

Synonyms of RossiantoniteHide

Other Language Names for RossiantoniteHide

Relationship of Rossiantonite to other SpeciesHide

Structurally related to group(s):

Fluorescence of RossiantoniteHide

dim green color, regardless of excitation frequency

Other InformationHide

Notes:
Rossiantonite dissolves very easily in cold, dilute HCl/H2O (1:1).
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 RossiantoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Galli, E., Brigatti, M.F., Malferrari, D., Sauro, F. and De Waele, J. (2013) Rossiantonite, IMA 2012-056. CNMNC Newsletter No. 15, February 2013, page 5; Mineralogical Magazine, 77, 1-12.
Galli, E., Brigatti, M.F., Malferrari, D., Sauro, F., De Waele, J. (2013): Rossiantonite, Al3(PO4)(SO4)2(OH)2(H2O)10•4H2O, a new hydrated aluminum phosphate-sulfate mineral from Chimanta massif, Venezuela: Description and crystal structure. American Mineralogist, 98, 1906-1913.

Internet Links for RossiantoniteHide

Localities for RossiantoniteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Venezuela
 
  • Bolívar
    • Auyán-tepui (Auyán-tepuy; Ayan Tepui)
Sauro, F., De Vivo, A., Vergara, F., & De Waele, J. (2013). Imawarì Yeuta: a new giant cave system in the quartz sandstones of the Auyan Tepui, Bolivar state, Venezuela. In Proceedings of the 16th International Congress of Speleology (Vol. 2, pp. 19-27).
    • Chimantá Massif (Chimantha Massif)
Galli, E., Brigatti, M.F., Malferrari, D., Sauro, F. and De Waele, J. (2013) Rossiantonite, IMA 2012-056. CNMNC Newsletter No. 15, February 2013, page 5; Mineralogical Magazine, 77, 1-12; Galli, E., Brigatti, M.F., Malferrari, D., Sauro, F., De Waele, J. (2013): Rossiantonite, Al3(PO4)(SO4)2(OH)2(H2O)10•4H2O, a new hydrated aluminum phosphate-sulfate mineral from Chimanta massif, Venezuela: Description and crystal structure. American Mineralogist, 98, 1906-1913.
Mineral and/or Locality  
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