Mineralogy Database

Niahite Mineral Data

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General Niahite Information

Help on Chemical  Formula: Chemical Formula: (NH4)(Mn++,Mg,Ca)PO4•(H2O)
Help on Composition: Composition: Molecular Weight = 180.15 gm
   Calcium      2.22 %  Ca    3.11 % CaO
   Magnesium    2.70 %  Mg    4.47 % MgO
   Manganese   21.35 %  Mn   27.56 % MnO
   Phosphorus  17.19 %  P    39.40 % P2O5
   Hydrogen     2.01 %  H      -   % Calc as (NH4)2O
   Hydrogen     1.34 %  H    12.00 % H2O
   Nitrogen     7.00 %  N    13.01 % (NH4)2O
   Oxygen      46.18 %  O
              ______        ______ 
              100.00 %       99.56 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)0.9Mn2+0.7Mg0.2Ca0.1(PO4)•1.2(H2O)
Help on Environment: Environment: Derived from the breakdown of bat guano.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Niah Great Cave, Sarawak, Malaysia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Niahite Say NIAHITE

Niahite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6469:1:0.5558
Help on Cell Dimensions: Cell Dimensions: a = 5.68, b = 8.78, c = 4.88, Z = 2; V = 243.37 Den(Calc)= 2.46
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: P mn21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.82(1), 2.832(0.9), 2.845(0.8),

Physical Properties of Niahite

Help on Color: Color: Light orange, Colorless.
Help on Density: Density: 2.39
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Streak: Streak: white

Optical Properties of Niahite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.37 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.331 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2432,KPDmeas= 0.2503,KC= 0.1827
Ncalc = 1.44 - 1.45
Help on Optical Data: Optical Data: Biaxial (-), a=1.582, b=1.604, g=1.609, bire=0.0270, 2V(Calc)=50, 2V(Meas)=54.

Calculated Properties of Niahite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.48 gm/cc
note: Specific Gravity of Niahite =2.46 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PENiahite = 6.44 barns/electron
U=PENiahite x rElectron Density= 15.97 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Niahite is Not Radioactive

Niahite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.01)where A++ B++ (XO4) � x(H2O)
  (40.01.02)Dana Group Dittmarite (NH4)Mg(PO4)•(H2O) P mn21 mm2 Niahite (NH4)(Mn,Mg,Ca)PO4•(H2O) P mn21 mm2
Help on  Strunz Class: Strunz Class: 08.CH.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CH -With large and medium-sized cations, RO4:H2O < 1:1
08.CH.20 Dittmarite (NH4)Mg(PO4)•(H2O) P mn21 mm2
08.CH.20 Niahite (NH4)(Mn,Mg,Ca)PO4•(H2O) P mn21 mm2

Other Niahite Information

Help on References: References: NAME( AntBidBlaNic4) 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 Niahite :
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: Strunz No: 08.CH.20





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