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Rossiantonite

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Formula:
Al3(PO4)(SO4)2(OH)2(H2O)14
System:
Triclinic
Colour:
colorless
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.

Classification of Rossiantonite

Approved
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Type Occurrence of Rossiantonite

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:

Physical Properties of Rossiantonite

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

Crystallography of Rossiantonite

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 Volume:
V 1,110.58 ų (Calculated from Unit Cell)
Z:
2
X-Ray 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.

Optical Data of Rossiantonite

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 Rossiantonite

Formula:
Al3(PO4)(SO4)2(OH)2(H2O)14
All elements listed in formula:

Relationship of Rossiantonite to other Species

Structurally related to group(s):

Other Names for Rossiantonite

Name in Other Languages:

Other Information

dim green color, regardless of excitation frequency
Other Information:
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 Rossiantonite

Reference List:
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 Rossiantonite

Localities for Rossiantonite

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.
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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