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Amarantite

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Formula:
Fe
3+
2
(SO
 
4
)
 
2
O · 7H
 
2
O
System:TriclinicColour: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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/D.01-40
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:31.9.3.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
Hey's CIM Ref.:25.10.17

25 : Sulphates
10 : Sulphates of Fe alone
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Type Occurrence of Amarantite

Type Locality:Caracoles, Sierra Gorda District, Antofagasta Province, Antofagasta Region, Chile
Place of Conservation of Type Material:BAF, 44700.
Year of Discovery:1888

Occurrences of Amarantite

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

Physical Properties of Amarantite

Lustre: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 (measured):2.189 - 2.286 g/cm3

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
Unit Cell Volume:V 674.09 ų (Calculated from Unit Cell)
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:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction:
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°
Maximum Birefringence:δ = 0.105

Chart 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:
Fe
3+
2
(SO
 
4
)
 
2
O · 7H
 
2
O
Simplified for copy/paste:Fe3+2(SO4)2O·7H2O
Essential elements:Fe, H, O, S
All elements listed in formula:Fe, H, O, S

Relationship of Amarantite to other Species

Common Associates:
SideronatriteHohmanniteFibroferriteCoquimbiteCopiapite
Chalcanthite
Related Minerals - Nickel-Strunz Grouping):

- +
7.DB.05Aubertite
CuAl(SO
 
4
)
 
2
Cl · 14H
 
2
O
7.DB.05Magnesioaubertite
(Mg,Cu)Al(SO
 
4
)
 
2
Cl · 14H
 
2
O
7.DB.05Svyazhinite
(Mg,Mn
2+
 
,Ca)(Al,Fe
3+
 
)(SO
 
4
)
 
2
F · 14H
 
2
O
7.DB.10Khademite
Al(SO
 
4
)F · 5H
 
2
O
7.DB.10Rostite
Al(SO
 
4
)(OH) · 5H
 
2
O
7.DB.15Jurbanite
Al(SO
 
4
)(OH) · 5H
 
2
O
7.DB.20Minasragrite
(V
4+
 
O)(SO
 
4
) · 5H
 
2
O
7.DB.20Orthominasragrite
(V
4+
 
O)(SO
 
4
) · 5H
 
2
O
7.DB.20Anorthominasragrite
(V
4+
 
O)(SO
 
4
) · 5H
 
2
O
7.DB.25Bobjonesite
(V
4+
 
O)(SO
 
4
) · 3H
 
2
O
7.DB.30Hohmannite
Fe
3+
2
(SO
 
4
)
 
2
O · 8H
 
2
O
7.DB.30Metahohmannite
Fe
3+
2
(SO
 
4
)
 
2
O · 4H
 
2
O
7.DB.35Aluminocopiapite
Al
 
2/3
Fe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
· 20H
 
2
O
7.DB.35Calciocopiapite
CaFe
 
4
(SO
 
4
)
 
6
(OH)
 
2
· 10H
 
2
O
7.DB.35Copiapite
Fe
2+
 
Fe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
· 20H
 
2
O
7.DB.35Cuprocopiapite
CuFe
 
4
(SO
 
4
)
 
6
(OH)
 
2
· 20H
 
2
O
7.DB.35Ferricopiapite
Fe
 
5
(SO
 
4
)
 
6
O(OH) · 20H
 
2
O
7.DB.35Magnesiocopiapite
MgFe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
· 20H
 
2
O
7.DB.35Zincocopiapite
ZnFe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
· 18H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
25.10.1Szomolnokite
FeSO
 
4
· H
 
2
O
25.10.2Rozenite
FeSO
 
4
· 4H
 
2
O
25.10.3Siderotil
FeSO
 
4
· 5H
 
2
O
25.10.4Ferrohexahydrite
FeSO
 
4
· 6H
 
2
O
25.10.5Melanterite
FeSO
 
4
· 7H
 
2
O
25.10.6Rhomboclase
(H
 
5
O
 
2
)Fe
3+
 
(SO
 
4
)
 
2
· 2H
 
2
O
25.10.7Lausenite
Fe
 
2
(SO
 
4
)
 
3
·6H
 
2
O
25.10.8Kornelite
Fe
 
2
(SO
 
4
)
 
3
· 7H
 
2
O
25.10.9Coquimbite
Fe
 
2-x
Al
 
x
(SO
 
4
)
 
3
· 9H
 
2
O, x ~0.5
25.10.10Paracoquimbite
Fe
 
2
(SO
 
4
)
 
3
· 9H
 
2
O
25.10.11Quenstedtite
Fe
 
2
(SO
 
4
)
 
3
· 10H
 
2
O
25.10.12Ferricopiapite
Fe
 
5
(SO
 
4
)
 
6
O(OH) · 20H
 
2
O
25.10.13Metahohmannite
Fe
3+
2
(SO
 
4
)
 
2
O · 4H
 
2
O
25.10.14Hohmannite
Fe
3+
2
(SO
 
4
)
 
2
O · 8H
 
2
O
25.10.15Butlerite
Fe
3+
 
(SO
 
4
)(OH) · 2H
 
2
O
25.10.16Parabutlerite
Fe
3+
 
(SO
 
4
)(OH) · 2H
 
2
O
25.10.18Fibroferrite
Fe
3+
 
(SO
 
4
)(OH) · 5H
 
2
O
25.10.19Hydroniumjarosite
(H
 
3
O)Fe
3+
3
(SO
 
4
)
 
2
(OH)
 
6
25.10.20Römerite
Fe
2+
 
Fe
3+
2
(SO
 
4
)
 
4
· 14H
 
2
O
25.10.21Bílinite
Fe
2+
 
Fe
3+
2
(SO
 
4
)
 
4
· 22H
 
2
O
25.10.22Copiapite
Fe
2+
 
Fe
3+
4
(SO
 
4
)
 
6
(OH)
 
2
· 20H
 
2
O

Other Names for Amarantite

Synonyms:
Castanite (of Bandy)Paposite
Other Languages:
German:Amarantit
Russian:Амарантит
Spanish:Amarantita

Other Information

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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Amarantite details from Handbook of Mineralogy (PDF)
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    Localities for Amarantite

    The 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. ? 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
      • La 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"
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