Pitticite Mineral Data

Pitticite Mineral Data +

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General Pitticite Information

Chemical Formula:

Hydrous ferric arsenate sulfate (Fe, AsO4, SO4, H2O)

Composition:

Molecular Weight = 364.69 gm

Iron 30.63 % Fe 43.79 % Fe₂O₃

Arsenic 20.54 % As 31.51 % As₂O₅

Hydrogen 0.55 % H 4.94 % H₂O

Sulfur 8.79 % S 21.95 % SO₃

Oxygen 39.48 % O

______ ______

100.00 % 102.19 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺₂(AsO₄)(SO₄)·(H₂O)

Environment:

Late secondary mineral formed by oxidation of earlier arsenic-bearing species, may be deposited by mine and spring waters.

IMA Status:

Valid Species (Pre-IMA) 1813

Locality:

Frieber, Schneeberg, Schwarzenberg, Johanngeorgenstadt, Marienber, and other districts in Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "pitch", for its typical resinous appearance.

Pitticite Image

Images:

Pitticite

Comments: Dark brown to orange-brown massive Pitticite.
Location: Graul, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Pitticite Crystallography

Crystal System:

Amorphous- No Crystals

Physical Properties of Pitticite

Cleavage:

None

Color:

Gray, Gray white, Yellow, Yellow brown, White.

Density:

2.5

Diaphaniety:

Transparent to Opaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

yellow white

Optical Properties of Pitticite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2491,KC= 0.2446

Optical Data:

Biaxial (?), a=1.61-1.63, b=1.616-1.635,

Calculated Properties of Pitticite

Electron Density:

r_electron=2.40 gm/cc
note: r_Pitticite=2.50 gm/cc.

Fermion Index

Fermion Index = 0.00734
Boson Index = 0.99266

Photoelectric:

PE_Pitticite= 23.71 barns/electron
U=PE_Pitticite x r_electron= 56.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pitticite is Not Radioactive

Pitticite Classification

Dana Class:

43.5.3.1 (43)Compound Phosphates, etc.

(43.5)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.5.3)Dana Group

43.5.3.1 Pitticite Hydrousferricarsenatesulfate(Fe,AsO4,SO4,H2O) None

43.5.3.2 Zykaite Fe4(AsO4)3(SO4)(OH)·15(H2O) Unk Ortho

Strunz Class:

VII/D.05-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.05 - Pitticite - Zykaite series

VII/D.05-10 Pitticite Hydrousferricarsenatesulfate(Fe,AsO4,SO4,H2O) None

VII/D.05-20 Diadochite Fe2(PO4)(SO4)(OH)·6(H2O) P1 1

VII/D.05-30 Sarmientite Fe2(AsO4)(SO4)(OH)·5(H2O) P 2₁/c 2/m

VII/D.05-40 Bukovskyite Fe2(AsO4)(SO4)(OH)·7(H2O) P1 or P1 Tri

VII/D.05-50 Tooeleite Fe(8-2x)[(As(1-x),S(x))O4]6·5(H2O) Pbcm,Pbc21 Ortho

VII/D.05-60 Zykaite Fe4(AsO4)3(SO4)(OH)·15(H2O) Unk Ortho

Other Pitticite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Dana) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Pitticite

Hydrous ferric arsenate sulfate (Fe, AsO4, SO4, H2O)
Dana No: 43.5.3.1 Strunz No: VII/D.05-10
Locality:

Notes: