Starkeyite Mineral Data

Starkeyite Mineral Data +

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General Starkeyite Information

Chemical Formula:

MgSO4·4(H2O)

Composition:

Molecular Weight = 192.43 gm

Magnesium 12.63 % Mg 20.94 % MgO

Hydrogen 4.19 % H 37.45 % H₂O

Sulfur 16.66 % S 41.61 % SO₃

Oxygen 66.52 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg(SO₄)·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 23911

PDF 24-720

Starkeyite Image

Images:

Starkeyite

Comments: Translucent starkeyite on rock.
Location: Barvue Mine, Barville, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Starkeyite Crystallography

Axial Ratios:

a:b:c =0.4353:1:0.581

Cell Dimensions:

a = 5.922, b = 13.604, c = 7.905, Z = 4; beta = 90.85° V = 636.78 Den(Calc)= 2.01

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.95(1), 4.48(1), 5.5(0.6),

Crystal Structure:

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Baur W H , Acta Crystallographica , 15 (1962) p.815-826, Zur kristallchemie der salzhydrate. Die kristallstrukturen von MgSO4*4H2O, (leonhardtit) und FeSO4*4H2O (rozenit), Locality: synthetic

View Additional jPOWD Structure files for Starkeyite
[1]

Physical Properties of Starkeyite

Color:

White.

Density:

2.007

Diaphaniety:

Transparent to Translucent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Starkeyite

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2451,KPDmeas= 0.2455,KC= 0.2429

Optical Data:

Biaxial (+), a=1.49, b=1.491, g=1.497, bire=0.0070, 2V(Calc)=46, 2V(Meas)=50.

Calculated Properties of Starkeyite

Electron Density:

r_electron=2.09 gm/cc
note: r_Starkeyite=2.01 gm/cc.

Fermion Index

Fermion Index = 0.0142
Boson Index = 0.9858

Photoelectric:

PE_Starkeyite= 1.38 barns/electron
U=PE_Starkeyite x r_electron= 2.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Starkeyite is Not Radioactive

Starkeyite Classification

Dana Class:

29.6.6.2 (29)Hydrated Acid and Sulfates

(29.6)where A XO4 · x(H2O)

(29.6.6)Rozenite Group (Monoclinic)

29.6.6.1 Rozenite FeSO4·4(H2O) P 2₁/n 2/m

29.6.6.2 Starkeyite MgSO4·4(H2O) P 2₁/n 2/m

29.6.6.3 Ilesite (Mn,Zn,Fe)SO4·4(H2O) P 2₁/n 2/m

29.6.6.4 Aplowite (Co,Mn,Ni)SO4·4(H2O) P 2₁/m 2/m

29.6.6.5 Boyleite (Zn,Mg)SO4·4(H2O) P 2₁/n 2/m

29.6.6.6 IMA2002-034! CdSO4·4(H2O) P 2₁/n 2/m

Strunz Class:

VI/C.03-10 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/C - Water-bearing sulfates without unfamiliar anions. cations of medium size

VI/C.03 - Rozenite series, Starkeyite - Boyleite

VI/C.03-10 Starkeyite MgSO4·4(H2O) P 2₁/n 2/m

VI/C.03-20 Rozenite FeSO4·4(H2O) P 2₁/n 2/m

VI/C.03-30 Ilesite (Mn,Zn,Fe)SO4·4(H2O) P 2₁/n 2/m

VI/C.03-40 Aplowite (Co,Mn,Ni)SO4·4(H2O) P 2₁/m 2/m

VI/C.03-50 Boyleite (Zn,Mg)SO4·4(H2O) P 2₁/n 2/m

Other Starkeyite Information

References:

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

See Also:

Links to other databases for Starkeyite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Starkeyite

MgSO4·4(H2O)
Dana No: 29.6.6.2 Strunz No: VI/C.03-10
Locality:

Notes: