Apjohnite Mineral Data

Apjohnite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[How the Club Works] [Memberships - Junior, Deluxe , and Platinum] [FAQ] [Past Minerals]
Join the Club - Junior, Deluxe and Platinum Memberships Available
High Quality Minerals Sent to Your Home or School Each Month
Mineral of the Month Club - An Inexpensive Way to Enjoy Minerals


General Apjohnite Information

Help on Chemical Formula: Chemical Formula: MnAl2(SO4)4•22(H2O)
Help on Composition: Composition: Molecular Weight = 889.49 gm
   Manganese   6.18 %  Mn    7.98 % MnO
   Aluminum    6.07 %  Al   11.46 % Al2O3
   Hydrogen    4.99 %  H    44.56 % H2O
   Sulfur     14.42 %  S    36.00 % SO3
   Oxygen     68.35 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+Al2(SO4)4•22(H2O)
Help on Environment: Environment: Found as efflorescences.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1838
Help on Locality: Locality: Maputo (Delagoa) Bay, near Maputo (Louren¸co Marques), Mozambique. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for James Apjohn (1796-1886), Professor of Chemistry and Mineralogy, Trinity College, Dublin, Ireland.
Help on Name Pronunciation: Name Pronunciation: Apjohnite + Pronunciation Say APJOHNITE
Help on Synonym: Synonym: ICSD 14038
  PDF 29-886
 

Apjohnite Image

Click Here for Larger Apjohnite Image in a New Browser Window Images:
Click Here for Larger Apjohnite Image

Apjohnite

Comments: White crystalline mass of apjohnite.
Location: Terlano, Bolzano, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Apjohnite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.2545:1:0.8734
Help on Cell Dimensions: Cell Dimensions: a = 6.198, b = 24.347, c = 21.266, Z = 4; beta = 100.28° V = 3,157.58 Den(Calc)= 1.87
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.52(1), 4.82(0.9), 3.79(0.35),
Click Here for Large Apjohnite Structure Window 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


Menchetti S , Sabelli C , Mineralogical Magazine , 40 (1976) p.599-608, The halotrichite group: The crystal structure of apjohnite, Locality: Terlano, Bolzano, Italy

 

Physical Properties of Apjohnite

Help on Color: Color: Colorless, White, Pale yellow, Pale green, Pale pink.
Help on Density: Density: 1.8
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Silky
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Apjohnite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.049 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.257,KPDmeas= 0.267,KC= 0.2547
Ncalc = 1.46 - 1.48
Help on Optical Data: Optical Data: Biaxial (-), a=1.478, b=1.482, g=1.482, bire=0.0040, 2V(Calc)=0, 2V(Meas)=0-15. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Apjohnite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.95 gm/cc
note: Specific Gravity of Apjohnite =1.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014170582
Boson Index = 0.9985829418
Help on Photoelectric: Photoelectric: PEApjohnite = 2.64 barns/electron
U=PEApjohnite x rElectron Density= 5.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Apjohnite is Not Radioactive
 

Apjohnite Classification
Help on Dana Class: Dana Class: 29.07.03.03 (29)Hydrated Acid and Sulfates
  (29.07)where A (B)2 (XO4)4 ˇ x(H2O)
  (29.07.03)Halotrichite Group (Monoclinic with 22 H2O)
 
29.07.03.01 Pickeringite MgAl2(SO4)4•22(H2O) P 2 2
 
29.07.03.02 Halotrichite FeAl2(SO4)4•22(H2O) P 2 2
 
29.07.03.03 Apjohnite MnAl2(SO4)4•22(H2O) P 21/c 2/m
 
29.07.03.04 Dietrichite (Zn,Fe,Mn)Al2(SO4)4•22(H2O) P 21/c 2/m
 
29.07.03.05 Bilinite FeFe2(SO4)4•22(H2O) P 21/c 2/m
 
29.07.03.06 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4•22(H2O) Mono
 
29.07.03.07 Wupatkiite (Co,Mg,Ni)Al2(SO4)4•22(H2O) P 21/c 2/m
Help on Strunz Class: Strunz Class: 07.CB.85 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CB -With only medium-sized cations
 
07.CB.85 Bilinite FeFe2(SO4)4•22(H2O) P 21/c 2/m
 
07.CB.85 Apjohnite MnAl2(SO4)4•22(H2O) P 21/c 2/m
 
07.CB.85 Dietrichite (Zn,Fe,Mn)Al2(SO4)4•22(H2O) P 21/c 2/m
 
07.CB.85 Halotrichite FeAl2(SO4)4•22(H2O) P 2 2
 
07.CB.85 Pickeringite MgAl2(SO4)4•22(H2O) P 2 2
 
07.CB.85 Redingtonite (Fe,Mg,Ni)(Cr,Al)2(SO4)4•22(H2O) Mono
 
07.CB.85 Wupatkiite (Co,Mg,Ni)Al2(SO4)4•22(H2O) P 21/c 2/m
 

Other Apjohnite Information
Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Apjohnite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Apjohnite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Apjohnite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Apjohnite Mineral Data :

Ask about Apjohnite 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 Espaņol

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

Apjohnite

MnAl2(SO4)4•22(H2O)
Dana No: 29.07.03.03 Strunz No: 07.CB.85
Locality:

 

Notes: