Apjohnite Mineral Data (original) (raw)

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:

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:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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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 � 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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Ask about Apjohnite here :
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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: