Mineralogy Database

Alleghanyite Mineral Data

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General Alleghanyite Information

Help on Chemical  Formula: Chemical Formula: Mn5(SiO4)2(OH)2
Help on Composition: Composition: Molecular Weight = 492.87 gm
   Manganese  55.73 %  Mn   71.96 % MnO
   Silicon    11.40 %  Si   24.38 % SiO2
   Hydrogen    0.41 %  H     3.66 % H2O
   Oxygen     32.46 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+5(SiO4)2(OH)2
Help on Environment: Environment: Manganese vein deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1932
Help on Locality: Locality: Bald Knob, Alleghany Co., North Carolina, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Alleghanyite + Pronunciation Say ALLEGHANYITE
Help on Synonym: Synonym: ICSD 14253
  PDF 43-683

Alleghanyite Image

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Comments: Massive, brown alleghanyite with white calcite.
Location: Parker Shaft, Franklin, Sussex County, New Jersey. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Galaxite   Alleghanyite

Comments: Black granular galaxite with reddish alleghanyite and white kutnohorite.
Location: Bald Knob, Alleghany County, North Carolina, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Alleghanyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.1522:1:1.7078
Help on Cell Dimensions: Cell Dimensions: a = 10.46, b = 4.86, c = 8.3, Z = 2; beta = 109.133° V = 398.63 Den(Calc)= 4.11
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.799(1), 2.86(0.8), 2.598(0.6),

Physical Properties of Alleghanyite

Help on Cleavage: Cleavage: None
Help on Color: Color: White, Brown, Bright pink, Grayish pink.
Help on Density: Density: 4
Help on Diaphaneity: Diaphaneity: Transparent to Subtransparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Lamellar - Distinctly foliated fine-grained forms.
Help on Hardness: Hardness: 6-5
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Alleghanyite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.079 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1888,KPDmeas= 0.194,KC= 0.2049
Ncalc = 1.82 - 1.84
Help on Optical Data: Optical Data: Biaxial (-), a=1.756, b=1.78, g=1.792, bire=0.0360, 2V(Calc)=68, 2V(Meas)=72. Dispersion r > v.

Calculated Properties of Alleghanyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.81 gm/cc
note: Specific Gravity of Alleghanyite =4.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0054786841
Boson Index = 0.9945213159
Help on Photoelectric: Photoelectric: PEAlleghanyite = 14.88 barns/electron
U=PEAlleghanyite x rElectron Density= 56.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Alleghanyite is Not Radioactive

Alleghanyite Classification

Help on  Dana Class: Dana Class: 52.03.02b.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.02b)Humite group (Chondrodite series)
52.03.02b.01 Alleghanyite Mn5(SiO4)2(OH)2 P 21/a 2/m
52.03.02b.02 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 21/c 2/m
52.03.02b.03 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 21/a 2/m
52.03.02b.04 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m
52.03.02b.05 Kumtyubeite! Ca5(SiO4)2F2 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.AF.45 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.45 Alleghanyite Mn5(SiO4)2(OH)2 P 21/a 2/m
09.AF.45 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 21/c 2/m
09.AF.45 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 21/a 2/m
09.AF.45 Kumtyubeite! Ca5(SiO4)2F2 P 21/a 2/m

Other Alleghanyite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Alleghanyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: 52.03.02b.01 Strunz No: 09.AF.45





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