Mineralogy Database

Pickeringite Mineral Data

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General Pickeringite Information

Help on Chemical  Formula: Chemical Formula: MgAl2(SO4)4•22(H2O)
Help on Composition: Composition: Molecular Weight = 858.86 gm
   Magnesium   2.83 %  Mg    4.69 % MgO
   Aluminum    6.28 %  Al   11.87 % Al2O3
   Hydrogen    5.16 %  H    46.15 % H2O
   Sulfur     14.93 %  S    37.29 % SO3
   Oxygen     70.79 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgAl2(SO4)4•22(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1844
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after J. Pickering (1777-1846).
Help on Name Pronunciation: Name Pronunciation: Pickeringite + Pronunciation Say PICKERINGITE
Help on Synonym: Synonym: Magnesia Alum
 

Pickeringite Image

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  Magnesioaubertite   Pickeringite

Comments: Aqua crystalline magnesioaubertite with white pickeringite.
Location: Grotto di Faraglione, Vulcano, Sicily, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Pickeringite

Comments: Radiating fibrous pickeringite.
Location: Patagonia, Santa Cruz County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pickeringite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8595:1:0.2553
Help on Cell Dimensions: Cell Dimensions: a = 20.8, b = 24.2, c = 6.18, Z = 4; beta = 95° V = 3,098.93 Den(Calc)= 1.84
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.82(1), 3.51(0.9), 4.32(0.35),
 

Physical Properties of Pickeringite

Help on Cleavage: Cleavage: {010} Indistinct
Help on Color: Color: Colorless, Yellowish white, Reddish white, Greenish white.
Help on Density: Density: 1.8 - 1.85, Average = 1.82
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Silky
Help on Streak: Streak: white
 

Optical Properties of Pickeringite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2607,KPDmeas= 0.2628,KC= 0.2569
Ncalc = 1.46 - 1.48
Help on Optical Data: Optical Data: Biaxial (-), a=1.476, b=1.48, g=1.483, bire=0.0070, 2V(Calc)=80, 2V(Meas)=60. Dispersion none.
 

Calculated Properties of Pickeringite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.93 gm/cc
note: Specific Gravity of Pickeringite =1.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0042975192
Boson Index = 0.9957024808
Help on Photoelectric: Photoelectric: PEPickeringite = 1.27 barns/electron
U=PEPickeringite x rElectron Density= 2.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pickeringite is Not Radioactive
 

Pickeringite Classification

Help on  Dana Class: Dana Class: 29.07.03.01 (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 Pickeringite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Pickeringite :
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 Pickeringite Specimen Label here :

Pickeringite

MgAl2(SO4)4•22(H2O)
Dana No: 29.07.03.01 Strunz No: 07.CB.85
Locality:

 

Notes:

 

 
   
 


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