Boyleite Mineral Data

Boyleite Mineral Data +

General Boyleite Information

Chemical Formula:

(Zn,Mg)SO4·4(H2O)

Composition:

Molecular Weight = 223.24 gm

Magnesium 2.72 % Mg 4.51 % MgO

Zinc 21.97 % Zn 27.34 % ZnO

Hydrogen 3.61 % H 32.28 % H₂O

Sulfur 14.36 % S 35.86 % SO₃

Oxygen 57.33 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Zn_0.75Mg_0.25(SO₄)·4(H₂O)

IMA Status:

Approved IMA 1978

Locality:

Link to MinDat.org Location Data.

Synonym:

IMA1977-026

Boyleite Image

Images:

Boyleite

Comments: Powdery white crust of boyleite on pyrite.
Location: Kotzebue, Alaska, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Boyleite Crystallography

Axial Ratios:

a:b:c =0.4374:1:0.5852

Cell Dimensions:

a = 5.95, b = 13.6, c = 7.96, Z = 4; beta = 90.3° V = 644.11 Den(Calc)= 2.30

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): 4.47(1), 5.46(1), 6.85(0.8),

Crystal Structure:

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Blake A J , Cooke P A , Hubberstey P , Sampson C L , Acta Crystallographica, Section E , 57 (2001) p.i109-i111, Zinc(II) sulfate tetrahydrate, Locality: synthetic

Physical Properties of Boyleite

Cleavage:

None

Color:

White.

Density:

2.41

Diaphaniety:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

2 - Gypsum

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Boyleite

Gladstone-Dale:

CI meas= 0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2303,KPDmeas= 0.2198,KC= 0.2255

Optical Data:

Biaxial (-), a=1.522, b=1.531, g=1.536, bire=0.0140, 2V(Calc)=72, 2V(Meas)=70.

Calculated Properties of Boyleite

Electron Density:

r_electron=2.34 gm/cc
note: r_Boyleite=2.30 gm/cc.

Fermion Index

Fermion Index = 0.01308
Boson Index = 0.98692

Photoelectric:

PE_Boyleite= 11.36 barns/electron
U=PE_Boyleite x r_electron= 26.57 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Boyleite is Not Radioactive

Boyleite Classification

Dana Class:

29.6.6.5 (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.03-50 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 Boyleite 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 Boyleite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Boyleite

(Zn,Mg)SO4·4(H2O)
Dana No: 29.6.6.5 Strunz No: VI/C.03-50
Locality:

Notes: