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Apjohnite Mineral Data

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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

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  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 - Prismatic H-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),
 

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 � 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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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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:

 

 
   
 


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