Starkeyite Mineral Data

Advertisment

Our Mission is Simple: RMS will be the go-to portal for all mineral, gem and rock shows in the USA

Your premier supplier of quality mineral specimens from Southern Africa and the world at large

A Bijoux.com is an online store specialized in the sale on the internet of precious stones , gems , minerals and jewels for individuals and professionals

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)

Environment:

Secondary mineral formed in the presence of iron sulfides; as efflorescences from evaporation of surface and ground waters.

IMA Status:

Valid Species (Pre-IMA) 1956

Locality:

Starkey mine, Madison Co., Missouri, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the localtiy.

Name Pronunciation:

Starkeyite + Pronunciation

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Diaphaneity:

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
Ncalc = 1.49

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:

Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Starkeyite =2.01 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Starkeyite= 1.38 barns/electron
U=PE_Starkeyite x rElectron Density= 2.88 barns/cc.

Radioactivity:

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

Starkeyite Classification

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

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

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 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

Search for Starkeyite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Starkeyite :

A Bijoux Google Search for Starkeyite
Adam's Minerals Google Search for Starkeyite
Cape Minerals Google Search for Starkeyite
Dakota Matrix Minerals Google Search for Starkeyite
Excalibur Mineral Corp. Google Search for Starkeyite
Exceptional Minerals Google Search for Starkeyite
John Betts Fine Minerals Search for Starkeyite
McDougall Minerals Google Search for Starkeyite
Mineral News Website Link
Rock and Mineral Shows Google Search for Starkeyite
Weinrich Minerals, Inc. Google Search for Starkeyite

Ask about Starkeyite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: