Pharmacosiderite Mineral Data

Pharmacosiderite Mineral Data
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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 Name Pronunciation: Name Pronunciation: Pharmacosiderite Say PHARMACOSIDERITE
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),
Help on Forms: Forms:

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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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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
Ncalc = 1.71 - 1.76
Help on Optical Data: Optical Data: Isotropic, n=1.693.
 

Calculated Properties of Pharmacosiderite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.77 gm/cc
note: Specific Gravity of Pharmacosiderite =2.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.005633139
Boson Index = 0.994366861
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)
Concentration of Pharmacosiderite per GRapi unit = 1.60 (%)

Estimated Radioactivity from Pharmacosiderite - barely detectable

 

Pharmacosiderite Classification
Help on Dana Class: Dana Class: 42.08.01.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.08)where (AB)7 (XO4)4 Zq · x(H2O)
  (42.08.01)Pharmacosiderite Group
 
42.08.01.01 Pharmacosiderite KFe4(AsO4)3(OH)4•6-7(H2O) I 43m 4 3m
 
42.08.01.02 Alumopharmacosiderite KAl4(AsO4)3(OH)4•6•5(H2O) P 43m 4 3m
 
42.08.01.03 Bariopharmacosiderite BaFe4(AsO4)3(OH)5•5(H2O) I 42m 4 2m
 
42.08.01.04 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5•5(H2O) P 43m ? 4 3m
 
42.08.01.05 Natropharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5•7(H2O) P 43m 4 3m
Help on Strunz Class: Strunz Class: 08.DK.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DK -With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
 
08.DK.10 Alumopharmacosiderite KAl4(AsO4)3(OH)4•6•5(H2O) P 43m 4 3m
 
08.DK.10 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5•5(H2O) P 43m ? 4 3m
 
08.DK.10 Bariopharmacosiderite BaFe4(AsO4)3(OH)5•5(H2O) I 42m 4 2m
 
08.DK.10 Barium-zinc-alumopharmacosiderite* (Ba,K)0.5(Zn,Cu)0.5(Al,Fe)4(AsO4)3•5(H2O) I 42m 4 2m
 
08.DK.10 Pharmacosiderite KFe4(AsO4)3(OH)4•6-7(H2O) I 43m 4 3m
 
08.DK.10 Natropharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5•7(H2O) P 43m 4 3m
 

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 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Pharmacosiderite

KFe+++4(AsO4)3(OH)4•6-7(H2O)
Dana No: 42.08.01.01 Strunz No: 08.DK.10
Locality:

 

Notes: