Mineralogy Database

Starkeyite Mineral Data

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General Starkeyite Information

Help on Chemical  Formula: Chemical Formula: MgSO4•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg(SO4)•4(H2O)
Help on Environment: Environment: Secondary mineral formed in the presence of iron sulfides; as efflorescences from evaporation of surface and ground waters.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1956
Help on Locality: Locality: Starkey mine, Madison Co., Missouri, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the localtiy.
Help on Name Pronunciation: Name Pronunciation: Starkeyite + Pronunciation Say STARKEYITE
Help on Synonym: Synonym: ICSD 23911
  PDF 24-720
 

Starkeyite Image

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  Starkeyite

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

Starkeyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4353:1:0.581
Help on Cell Dimensions: Cell Dimensions: a = 5.922, b = 13.604, c = 7.905, Z = 4; beta = 90.85° V = 636.78 Den(Calc)= 2.01
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.95(1), 4.48(1), 5.5(0.6),
 

Physical Properties of Starkeyite

Help on Color: Color: White.
Help on Density: Density: 2.007
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white
 

Optical Properties of Starkeyite

Help on Gladstone-Dale: 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
Ncalc = 1.49
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Starkeyite =2.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEStarkeyite = 1.38 barns/electron
U=PEStarkeyite x rElectron Density= 2.88 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Starkeyite is Not Radioactive
 

Starkeyite Classification

Help on  Dana Class: Dana Class: 29.06.06.02 (29)Hydrated Acid and Sulfates
  (29.06)where A XO4 � x(H2O)
  (29.06.06)Rozenite Group (Monoclinic)
 
29.06.06.01 Rozenite FeSO4•4(H2O) P 21/n 2/m
 
29.06.06.02 Starkeyite MgSO4•4(H2O) P 21/n 2/m
 
29.06.06.03 Ilesite (Mn,Zn,Fe)SO4•4(H2O) P 21/n 2/m
 
29.06.06.04 Aplowite (Co,Mn,Ni)SO4•4(H2O) P 21/m 2/m
 
29.06.06.05 Boyleite (Zn,Mg)SO4•4(H2O) P 21/n 2/m
 
29.06.06.06 IMA2002-034! CdSO4•4(H2O) P 21/n 2/m
Help on  Strunz Class: Strunz Class: 07.CB.15 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CB -With only medium-sized cations
 
07.CB.15 Boyleite (Zn,Mg)SO4•4(H2O) P 21/n 2/m
 
07.CB.15 Aplowite (Co,Mn,Ni)SO4•4(H2O) P 21/m 2/m
 
07.CB.15 Ilesite (Mn,Zn,Fe)SO4•4(H2O) P 21/n 2/m
 
07.CB.15 Rozenite FeSO4•4(H2O) P 21/n 2/m
 
07.CB.15 Starkeyite MgSO4•4(H2O) P 21/n 2/m
 
07.CB.15 IMA2002-034! CdSO4•4(H2O) P 21/n 2/m
 

Other Starkeyite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Starkeyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Starkeyite

MgSO4•4(H2O)
Dana No: 29.06.06.02 Strunz No: 07.CB.15
Locality:

 

Notes:

 

 
   
 


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