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Amarantite

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Formula:
Fe23+(SO4)2O · 7H2O
System:
Triclinic
Colour:
Amaranth-red to brownish ...
Hardness:
Name:
From the Greek αμάραντος = amaranth, an imaginary red undying flower, in allusion to its colour.
This page provides mineralogical data about Amarantite.

Classification of Amarantite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
7.DB.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
31.9.3.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.10.17

25 : Sulphates
10 : Sulphates of Fe alone
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First Recorded Occurrence of Amarantite

Place of Conservation of First Recorded Material:
BAF, 44700.
Year of Discovery:
1888

Occurrences of Amarantite

Geological Setting:
A secondary mineral formed especially in arid climates.

Physical Properties of Amarantite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Amaranth-red to brownish red and red-orange
Streak:
Lemon-yellow
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
On {010} and {100}, perfect.
Density:
2.189 - 2.286 g/cm3 (Measured)    

Crystallography of Amarantite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 8.9Å, b = 11.56Å, c = 6.64Å
α = 95.55°, β = 90.52°, γ = 97.42°
Ratio:
a:b:c = 0.77 : 1 : 0.574
Morphology:
Crystals, to 2 cm, elongated along [001], with dominant {100} and {010}, and square cross section; also flattened [100] and striated on {001}; more than 60 forms recorded; typically in radiating or matted aggregates of needles; columnar or bladed.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction Data:
d-spacingIntensity
11.25 (FFF)
8.69 (FFF)
5.16 (mF)
4.98 (mF)
3.57 (FF)
3.11 (F)
3.05 (FF)

Optical Data of Amarantite

Type:
Biaxial (-)
RI values:
nα = 1.516 nβ = 1.598 nγ = 1.621
2V:
Measured: 30° , Calculated: 52°
Max Birefringence:
δ = 0.105
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Pleochroism:
Visible
Comments:
X = colourless
Y = Light yellow
Z = Reddish brown

Chemical Properties of Amarantite

Formula:
Fe23+(SO4)2O · 7H2O
Essential elements:
All elements listed in formula:

Relationship of Amarantite to other Species

7.DB.05AubertiteCuAl(SO4)2Cl · 14H2O
7.DB.05Magnesioaubertite(Mg,Cu)Al(SO4)2Cl · 14H2O
7.DB.05Svyazhinite(Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O
7.DB.10KhademiteAl(SO4)F · 5H2O
7.DB.10RostiteAl(SO4)(OH) · 5H2O
7.DB.15JurbaniteAl(SO4)(OH) · 5H2O
7.DB.20Minasragrite(V4+O)(SO4) · 5H2O
7.DB.20Orthominasragrite(V4+O)(SO4) · 5H2O
7.DB.20Anorthominasragrite(V4+O)(SO4) · 5H2O
7.DB.25Bobjonesite(V4+O)(SO4) · 3H2O
7.DB.30HohmanniteFe23+(SO4)2O · 8H2O
7.DB.30MetahohmanniteFe23+(SO4)2O · 4H2O
7.DB.35AluminocopiapiteAl2/3Fe43+(SO4)6(OH)2 · 20H2O
7.DB.35CalciocopiapiteCaFe4(SO4)6(OH)2 · 10H2O
7.DB.35CopiapiteFe2+Fe43+(SO4)6(OH)2 · 20H2O
7.DB.35CuprocopiapiteCuFe4(SO4)6(OH)2 · 20H2O
7.DB.35FerricopiapiteFe5(SO4)6O(OH) · 20H2O
7.DB.35MagnesiocopiapiteMgFe43+(SO4)6(OH)2 · 20H2O
7.DB.35ZincocopiapiteZnFe43+(SO4)6(OH)2 · 18H2O
25.10.1SzomolnokiteFeSO4 · H2O
25.10.2RozeniteFeSO4 · 4H2O
25.10.3SiderotilFeSO4 · 5H2O
25.10.4FerrohexahydriteFeSO4 · 6H2O
25.10.5MelanteriteFeSO4 · 7H2O
25.10.6Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2O
25.10.7LauseniteFe2(SO4)3·5H2O
25.10.8KorneliteFe2(SO4)3 · 7H2O
25.10.9CoquimbiteFe2-xAlx(SO4)3 · 9H2O, x ~0.5
25.10.10ParacoquimbiteFe2(SO4)3 · 9H2O
25.10.11QuenstedtiteFe2(SO4)3 · 10H2O
25.10.12FerricopiapiteFe5(SO4)6O(OH) · 20H2O
25.10.13MetahohmanniteFe23+(SO4)2O · 4H2O
25.10.14HohmanniteFe23+(SO4)2O · 8H2O
25.10.15ButleriteFe3+(SO4)(OH) · 2H2O
25.10.16ParabutleriteFe3+(SO4)(OH) · 2H2O
25.10.18FibroferriteFe3+(SO4)(OH) · 5H2O
25.10.19Hydroniumjarosite(H3O)Fe33+(SO4)2(OH)6
25.10.20RömeriteFe2+Fe23+(SO4)4 · 14H2O
25.10.21BíliniteFe2+Fe23+(SO4)4 · 22H2O
25.10.22CopiapiteFe2+Fe43+(SO4)6(OH)2 · 20H2O

Other Names for Amarantite

Name in Other Languages:

Other Information

Other Information:
Decomposed by cold water with the formation of an insoluble basic salt. Soluble in HCl.
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 Amarantite

Reference List:
Darapsky, L. (1887): Paposit, ein neues Eisensulphat. Boletin de la Sociedad Nacional de Mineria, Santiago de Chile, No. 92: 735 [as Paposite].

Frenzel, A. (1888): XVII. Mineralogisches. 10. Hohmannit. 11. Amarantit. 12. Vorkommnisse von Ehrenfriedersdorf. Mineralogische und Petrographische Mittheilungen, Vienna. 9: 397-400.

Bauer (1889): [Review of Darapsky (1887) and Frenzel (1888)]. Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I, 3: Referate: 23-24.

Darapsky, L. (1890): Ueber einige Mineralien aus Atacama. Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: I: 49.

Gräbner analysis in: Frenzel (1890) Mineralogische und petrographische Mitteilungen, Vienna: 11: 223.

Penfield, S. L. (1890): Crystallographic notes. American Journal of Science. 40: 199-207.

Dana, E.S. (1892): System of Mineralogy, 6th. Edition, New York: 967, 968.

Posnjak, E. and Merwin, H.E. (1922): The system, Fe2O3—SO3—H2O. Journal of the American Chemical Society. 44: 1965-1994 (artificial material).

Scharizer in: Doelter, C. (1927) Handbuch der Mineral-chemie (in 4 volumes divided into parts): 4 [2]: 574.

Scharizer (1927): Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig. 65: 347-.

Ungemach (1935): Bulletin de la Société française de Minéralogie. 58: 115-.

Bandy, M. C. (1938): Mineralogy of three sulphate deposits of Northern Chile. American Mineralogist. 23, 669-760.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 611-613.

Süsse, P. (1967): Crystal structure of amarantite. em>Naturwissenschaften, 54, 642-643.

Süsse, P. (1968): The crystal structure of amarantite, Fe2(SO4)2O·7H2O. Zeitschrift für Kristallographie. 127, 261-275

Giacovazzo, C. & Menchetti, S. (1968): Dati strutturali sulla amarantite. Periodico di mineralogia – Roma, xx, 727-731.

Rosman, G. R. (1976): The optical spectroscopic comparison of the ferric iron tetrameric clusters in amarantite and leucophosphite. American Mineralogist . 61, 933-938.

Scordari, F. et al. (2004): American Mineralogist: 89: 365-370.

Internet Links for Amarantite

Specimens:
The following Amarantite specimens are currently listed for sale on minfind.com.

Localities for Amarantite

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.
Argentina
 
  • San Juan
    • Calingasta Department
      • Calingasta
        • Quebrada Alcaparrosa
Angelelli, Victorio and Gordon, Samuel, G. (1941) Sarmientite, a new mineral from Argentina. Notulae Naturae of The Academy of Natural Sciences of Philadelphia, #92.
Australia
 
  • South Australia
    • Olary Province
      • Mingary
        • Pine Creek - Mutooroo area
Noble R.J, Just J, Johnson J. E. (1983), Catalogue of South Australian Minerals - 1983, Govenment Printer, South Australia.
Chile
 
  • Antofagasta Region
    • Antofagasta Province
      • Reventon District
        • Officina Paposa
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 612.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 614.
Bulletin de Minéralogie 87 (1964), 125
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 612.
    • El Loa Province
      • Calama
        • Cerritos Bayos
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 612.; Kampf, A.R.; Mills, S.J.; Housley, R.M.; Williams, P.A.; Dini, M. (2012): Alcaparrosaite, K3Ti4+Fe3+(SO4)4O(H2O)2, a new hydrophobic Ti4+ sulfate from Alcaparrosa, Chile. Mineralogical Magazine 76, 851-861.
        • Chuquicamata District
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 612.
          • Toki Cu deposit (Toki Cluster)
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 612.
  • Arica and Parinacota Region
    • Arica Province
      • Los Camarones
Samples analysed by Tony Kampf of LAC Mineralogical Museum, USA
  • Atacama Region
    • Copiapó Province
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 612.
  • Tarapacá Region
    • El Tamarugal Province
      • Pampa del Tamarugal
Peter G. Seroka collection
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem altem Bergbau und den Schlacken von Lavrion (I). Mineralien-Welt 25 (1), 60-75 (in German). [identification announced; no description given yet]
Iran
 
  • Yazd Province
    • Saghand (Sagand; Saqand)
Bariand, P., Cesbron, F. & Berthelon, J. P. (1977): Iron sulfates of Saghand near Yazd (Iran). Memoire Hors-Série de la Société Géologique de France 8, 77-85.; Bariand, P., Berthelon, J. P., Cesbron, F. & Sadrzadeh, M. (1973): New aluminum sulfate hydrate, khademite of Saghand (Iran). Comptes Rendus des Seances de l'Académie des Sciences, Série C, 277, 1585-1588 (in French).
Italy
 
  • Tuscany
    • Livorno Province
      • Elba Island
        • Capoliveri
          • Cape Calamita Mine (Calamita Mine)
F. Quagliarella (1966) - Su alcuni solfati di Capo Calamita (Isola d'Elba) - Rend. Soc. Min. It., 22: 210.
Norway
 
  • Oppland
    • Sel
      • Otta
Selbekk, R. S., Husdal, T. A. & Berg, H-J. (2010): Nye mineraler for Norge i 2010. Stein. 37 (4): 24-26
Slovakia
 
  • Prešov Region
    • Prešov Co.
      • Červenica
Duda,R. et. all.,1981: MIneralogia severnej časti Slanských vrchov. Min.Slovaca,Monografia 2, Bratislava, 98p
USA
 
  • California
    • Riverside Co.
Schairer, John Frank & C.C. Lawson (1924), Copiapite from the Santa Maria Mountains, eastern Riverside County, California: American Mineralogist: 9: 242; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 63.
Schairer, John Frank & C.C. Lawson (1924), Copiapite from the Santa Maria Mountains, eastern Riverside County, California: American Mineralogist: 9: 242-244; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 612, 626; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 156.
  • New Mexico
Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996
Minerals of New Mexico 3rd ed.
  • South Dakota
    • Pennington Co.
      • Hayward
SDSMT Bull 18 Roberts and Rapp "Mineralogy of the Black Hills"
Mineral and/or Locality  
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