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Larderellite Mineral Data

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General Larderellite Information

Help on Chemical  Formula: Chemical Formula: (NH4)B5O6(OH)4
Help on Composition: Composition: Molecular Weight = 236.11 gm
   Boron     22.89 %  B    73.71 % B2O3
   Hydrogen   1.71 %  H      -   % Calc as (NH4)2O
   Hydrogen   1.71 %  H    15.26 % H2O
   Nitrogen   5.93 %  N    11.03 % (NH4)2O
   Oxygen    67.76 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)B5O6(OH)4
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1854
Help on Locality: Locality: Lardarello, Val di Cecina, Pisa, Toscana, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for count Francesco de Larderelle (1848-1925), owner of the "BORAX mine" in Tuscany, Italy
Help on Name Pronunciation: Name Pronunciation: Larderellite + Pronunciation Say LARDERELLITE

Larderellite Image

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Comments: Colorless larderellite crystals.
Location: Larderello, Cecina Valley, Pisa province, Tuscany, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Larderellite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.6265:1:1.3212
Help on Cell Dimensions: Cell Dimensions: a = 11.63, b = 7.15, c = 9.447, Z = 4; beta = 96.75° V = 780.12 Den(Calc)= 2.01
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): 2.887(1), 2.921(1), 4.7(1),

Physical Properties of Larderellite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Yellowish, White.
Help on Density: Density: 1.905
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Streak: Streak: white

Optical Properties of Larderellite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.323 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.253 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2637,KPDmeas= 0.2782,KC= 0.2104
Ncalc = 1.4 - 1.42
Help on Optical Data: Optical Data: Biaxial (+), a=1.509, b=1.52, g=1.561, bire=0.0520, 2V(Calc)=56, 2V(Meas)=64.

Calculated Properties of Larderellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.04 gm/cc
note: Specific Gravity of Larderellite =2.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PELarderellite = 0.33 barns/electron
U=PELarderellite x rElectron Density= 0.67 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Larderellite is Not Radioactive

Larderellite Classification

Help on  Dana Class: Dana Class: (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.05)Dana Type
  (26.05.04)Dana Group Larderellite (NH4)B5O6(OH)4 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 06.EB.05 06 - BORATES
  06.E - Pentaborates
  06.EB -Ino-pentaborates
06.EB.05 Larderellite (NH4)B5O6(OH)4 P 21/a 2/m

Other Larderellite Information

Help on References: References: NAME( Dana8) 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 Larderellite :
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 - 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: 06.EB.05





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