Larderellite Mineral Data

General Larderellite Information

Chemical Formula:

(NH4)B5O6(OH)4

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

Empirical Formula:

(NH₄)B₅O₆(OH)₄

IMA Status:

Valid Species (Pre-IMA) 1854

Locality:

Lardarello, Val di Cecina, Pisa, Toscana, Italy Link to MinDat.org Location Data.

Name Origin:

Named for count Francesco de Larderelle (1848-1925), owner of the "BORAX mine" in Tuscany, Italy

Name Pronunciation:

Larderellite + Pronunciation

Larderellite Image

Images:

Larderellite

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

Larderellite Crystallography

Axial Ratios:

a:b:c =1.6265:1:1.3212

Cell Dimensions:

a = 11.63, b = 7.15, c = 9.447, Z = 4; beta = 96.75° V = 780.12 Den(Calc)= 2.01

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/I_o): 2.887(1), 2.921(1), 4.7(1),

Physical Properties of Larderellite

Cleavage:

{100} Perfect

Color:

Yellowish, White.

Density:

1.905

Hardness:

1-2 - Between Talc and Gypsum

Streak:

white

Optical Properties of Larderellite

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

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

Electron Density:

Bulk Density (Electron Density)=2.04 gm/cc
note: Specific Gravity of Larderellite =2.01 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Larderellite= 0.33 barns/electron
U=PE_Larderellite x rElectron Density= 0.67 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Larderellite is Not Radioactive

Larderellite Classification

Dana Class:

26.05.04.01 (26)Hydrated Borates Containing Hydroxyl or Halogen

(26.05)Dana Type

(26.05.04)Dana Group

26.05.04.01 Larderellite (NH4)B5O6(OH)4 P 2₁/a 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
16 - WWW-MINCRYST

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Larderellite

(NH4)B5O6(OH)4
Dana No: 26.05.04.01 Strunz No: 06.EB.05
Locality:

Notes:

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