Mineralogy Database

Purpurite Mineral Data

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General Purpurite Information

Help on Chemical  Formula: Chemical Formula: Mn+++PO4
Help on Composition: Composition: Molecular Weight = 149.91 gm
   Manganese   36.65 %  Mn   52.66 % Mn2O3
   Phosphorus  20.66 %  P    47.34 % P2O5
   Oxygen      42.69 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn3+(PO4)
Help on Environment: Environment: Forms a series with the Fe+++ end-member heterosite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1905
Help on Locality: Locality: Faires tin mine, Kings Mt, Gaston Co., North Carolina, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Latin purpureus - "purple red."
Help on Name Pronunciation: Name Pronunciation: Purpurite + Pronunciation Say PURPURITE
Help on Synonym: Synonym: ICSD 38210
  PDF 37-478

Purpurite Image

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Comments: Massive purpurite, which never forms crystals but is only found in masses.
Location: Newry, Maine, USA. Scale: 6.5 x 4 cm.
© John Veevaert

Purpurite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.601:1:0.4917
Help on Cell Dimensions: Cell Dimensions: a = 5.83, b = 9.7, c = 4.77, Z = 4; V = 269.75 Den(Calc)= 3.69
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmnb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.448(1), 2.952(1), 4.37(0.7),

Physical Properties of Purpurite

Help on Cleavage: Cleavage: {100} Perfect, {001} Perfect
Help on Color: Color: Brownish black, Violet, Dark pink, Dark red, Reddish purple.
Help on Density: Density: 3.4
Help on Diaphaneity: Diaphaneity: Subtranslucent to Opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: red

Optical Properties of Purpurite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.073 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2423,KPDmeas= 0.2629,KC= 0.2451
Ncalc = 1.83 - 1.9
Help on Optical Data: Optical Data: Biaxial (+), a=1.85, b=1.912, g=1.92, bire=0.0700, 2V(Calc)=38, 2V(Meas)=38. Dispersion relatively strong.
Help on Pleochroism (x): Pleochroism (x): gray.
Help on Pleochroism (y): Pleochroism (y): deep blood red.

Calculated Properties of Purpurite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Purpurite =3.69 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002049161
Boson Index = 0.9997950839
Help on Photoelectric: Photoelectric: PEPurpurite = 10.45 barns/electron
U=PEPurpurite x rElectron Density= 37.03 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Purpurite is Not Radioactive

Purpurite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.01)Dana Group Heterosite FePO4 Pmnb 2/m 2/m 2/m Purpurite MnPO4 Pmnb 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.AB.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AB -With medium-sized cations
08.AB.10 Ferrisicklerite Li(Fe,Mn)PO4 Pmnb 2/m 2/m 2/m
08.AB.10 Heterosite FePO4 Pmnb 2/m 2/m 2/m
08.AB.10 Natrophilite NaMnPO4 Pnam 2/m 2/m 2/m
08.AB.10 Lithiophilite LiMnPO4 Pmnb 2/m 2/m 2/m
08.AB.10 Purpurite MnPO4 Pmnb 2/m 2/m 2/m
08.AB.10 Sicklerite Li(Mn,Fe)PO4 Pmnb 2/m 2/m 2/m
08.AB.10 Simferite Li(Mg,Fe,Mn)2(PO4)2 Pbnm or Pbn21 Ortho
08.AB.10 Triphylite LiFePO4 Pbnm 2/m 2/m 2/m

Other Purpurite Information

Help on See Also: See Also: Links to other databases for Purpurite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - Scandinavian mineral gallery
19 - theimage

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Dana No: Strunz No: 08.AB.10





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