Amarillite Mineral Data

General Amarillite Information

Chemical Formula:

NaFe+++(SO4)2•6(H2O)

Composition:

Molecular Weight = 379.06 gm

Sodium 6.07 % Na 8.18 % Na₂O

Iron 14.73 % Fe 21.06 % Fe₂O₃

Hydrogen 3.19 % H 28.52 % H₂O

Sulfur 16.92 % S 42.24 % SO₃

Oxygen 59.09 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaFe³⁺(SO₄)₂•6(H₂O)

Environment:

Oxidation zones of sulfide deposits.

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

Tierra Amarilla, southeast of Copiapo, Atacama, Chile Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Amarillite + Pronunciation

Synonym:

ICSD 69132

PDF 80-1306

Amarillite Image

Images:

Amarillite

Comments: Yellowish white, powdery crystals of amarillite crystals.
Location: Grotta de Faraglione, Porte de Levante, Island de Vulcano, Italy. Scale: Specimen Size 15 x10 x 7 mm.
© Sergey Vasiliev / Systematic Mineralogy

Amarillite Crystallography

Axial Ratios:

a:b:c =0.7765:1:1.1504

Cell Dimensions:

a = 8.419, b = 10.8409, c = 12.4717, Z = 4; beta = 95.495° V = 1,133.06 Den(Calc)= 2.22

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

Forms:

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Forms: ( 3 3 1) ( 1 1 2) ( 1 0 1) ( 1 1 1) ( 1 1 2) ( 1 1 0) ( 1 1 3) ( 1 1 1) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Li J J , Zhou J L , Dong W , Chinese Science Bulletin , 35 (1990) p.2073-2075, The structure of amarillite, Locality: Qinghai Province, China

Physical Properties of Amarillite

Cleavage:

{110} Good

Color:

Greenish yellow, Light yellow.

Density:

2.19

Diaphaneity:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Amarillite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.252,KPDmeas= 0.2554,KC= 0.2536
Ncalc = 1.56

Optical Data:

Biaxial (+), a=1.532, b=1.555, g=1.591, bire=0.0590

Calculated Properties of Amarillite

Electron Density:

Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Amarillite =2.22 gm/cc.

Fermion Index:

Fermion Index = 0.0046807815
Boson Index = 0.9953192185

Photoelectric:

PE_Amarillite= 5.42 barns/electron
U=PE_Amarillite x rElectron Density= 12.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Amarillite is Not Radioactive

Amarillite Classification

Dana Class:

29.05.03.02 (29)Hydrated Acid and Sulfates

(29.05)where A B (XO4)2 · x(H2O)

(29.05.03)Dana Group

29.05.03.01 Tamarugite NaAl(SO4)2•6(H2O) P 2₁/a 2/m

29.05.03.02 Amarillite NaFe(SO4)2•6(H2O) C 2/c 2/m

Strunz Class:

07.CC.75 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CC -With medium-sized and large cations

07.CC.75 Amarillite NaFe(SO4)2•6(H2O) C 2/c 2/m

Other Amarillite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Amarillite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Amarillite Specimen Label here :

Amarillite

NaFe+++(SO4)2•6(H2O)
Dana No: 29.05.03.02 Strunz No: 07.CC.75
Locality:

Notes: