Pharmacosiderite Mineral Data + Say PHARMACOSIDERITE


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General Pharmacosiderite Information

Help on Chemical  Formula: Chemical Formula: KFe+++4(AsO4)3(OH)4·6-7(H2O)
Help on Composition: Composition: Molecular Weight = 873.38 gm
   Potassium   4.48 %  K     5.39 % K2O
   Iron       25.58 %  Fe   36.57 % Fe2O3
   Arsenic    25.74 %  As   39.47 % As2O5
   Hydrogen    2.08 %  H    18.56 % H2O
   Oxygen     42.13 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KFe3+4(AsO4)3(OH)4·7(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1813
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek, farmakon for "poison" and sideros for "iron."
Help on Synonym: Synonym: ICSD 27302
  PDF 34-155
 

Pharmacosiderite Image

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Pharmacosiderite   Arthurite

Comments: Altered rhyolite vug lined with brilliant apple green arthurite and cubic green crystals of pharmacosiderite.
Location: Majuba Hill Mine, Pershing County, Nevada. USA. Scale: 2.7 x 1.7 cm.
© John Veevaert

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Pharmacosiderite

Comments: Translucent yellow-brown cubic Pharmacosiderite crystals.
Location: Wheal Gorland, Saint Day, Cornwall, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pharmacosiderite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 15.961, Z = 8; V = 4,066.12 Den(Calc)= 2.85
Help on Crystal System: Crystal System: Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: I 43m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.61(1), 8(0.9), 2.408(0.8),
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Forms: [ 1 0 0] [ 0 1 1] [ 1 1 1]

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Buerger M J , Dollase W A , Garaycochea-Wittke I , Zeitschrift fur Kristallographie , 125 (1967) p.92-108, The structure and composition of the mineral pharmacosiderite, Note: the K atom could not be located, Locality: Cornwall, England

 

Physical Properties of Pharmacosiderite

Help on Cleavage: Cleavage: [100] Indistinct
Help on Color: Color: Olive green, Emerald green, Reddish brown, Yellowish brown, Honey yellow.
Help on Density: Density: 2.8 - 3, Average = 2.9
Help on Diaphaniety: Diaphaniety: Subtransparent to subtranslucent
Help on Fracture: Fracture: Brittle - Sectile - Brittle fracture with slightly sectile shavings possible.
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Adamantine - Resinous
Help on Streak: Streak: yellowish green
 

Optical Properties of Pharmacosiderite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.055 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2432,KPDmeas= 0.239,KC= 0.2528
Help on Optical Data: Optical Data: Isotropic, n=1.693.
 

Calculated Properties of Pharmacosiderite

Help on Electron Density: Electron Density:

relectron=2.77 gm/cc
note: rPharmacosiderite =2.85 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00563
Boson Index = 0.99437
Help on Photoelectric: Photoelectric:

PEPharmacosiderite = 25.35 barns/electron
U=PEPharmacosiderite x relectron= 70.15 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 62.69 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Pharmacosiderite - barely detectable

 

Pharmacosiderite Classification

Help on  Dana Class: Dana Class: 42.8.1.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.8)where (AB)7 (XO4)4 Zq · x(H2O)
  (42.8.1)Dana Group
 
42.8.1.1 Pharmacosiderite KFe4(AsO4)3(OH)4·6-7(H2O) I 43m 4 3m
 
42.8.1.2 Alumopharmacosiderite KAl4(AsO4)3(OH)4·6·5(H2O) P 43m 4 3m
 
42.8.1.3 Barium-pharmacosiderite BaFe4(AsO4)3(OH)5·5(H2O) I 42m 4 2m
 
42.8.1.4 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5·5(H2O) P 43m ? 4 3m
 
42.8.1.5 Sodium-pharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5·7(H2O) P 43m 4 3m
Help on  Strunz Class: Strunz Class: VII/D.47-20 VII - Phosphates, Arsenates and Vanadates
  VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K
  VII/D.47 - Pharmacosiderite series
 
VII/D.47-10 Alumopharmacosiderite KAl4(AsO4)3(OH)4·6·5(H2O) P 43m 4 3m
 
VII/D.47-20 Pharmacosiderite KFe4(AsO4)3(OH)4·6-7(H2O) I 43m 4 3m
 
VII/D.47-30 Sodium-pharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5·7(H2O) P 43m 4 3m
 
VII/D.47-40 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5·5(H2O) P 43m ? 4 3m
 
VII/D.47-50 Barium-pharmacosiderite BaFe4(AsO4)3(OH)5·5(H2O) I 42m 4 2m
 

Other Pharmacosiderite 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 Pharmacosiderite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 - Franklin Minerals(Dunn) 7 -Google Images 8 -Google Scholar 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris

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Pharmacosiderite

KFe+++4(AsO4)3(OH)4·6-7(H2O)
Dana No: 42.8.1.1 Strunz No: VII/D.47-20
Locality:

 

Notes:

 

 
   
 
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