Mineralogy Database

Searlesite Mineral Data

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General Searlesite Information

Help on Chemical  Formula: Chemical Formula: NaBSi2O5(OH)2
Help on Composition: Composition: Molecular Weight = 203.98 gm
   Sodium    11.27 %  Na   15.19 % Na2O
   Silicon   27.54 %  Si   58.91 % SiO2
   Boron      5.30 %  B    17.06 % B2O3
   Hydrogen   0.99 %  H     8.83 % H2O
   Oxygen    54.90 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaBSi2O5(OH)2
Help on Environment: Environment: Continental alkaline evaporite deposits and alcalic-pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1914
Help on Locality: Locality: Searles Lake, San Bernardino Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after it's locality.
Help on Name Pronunciation: Name Pronunciation: Searlesite + Pronunciation Say SEARLESITE
Help on Synonym: Synonym: ICSD 12134
  PDF Jun-37

Searlesite Image

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Comments: Clear, prismatic crystal of Searlesite.
Location: Point of Rocks Mesa. Colfax County, New Mexico, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Searlesite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1304:1:0.6948
Help on Cell Dimensions: Cell Dimensions: a = 7.972, b = 7.052, c = 4.9, Z = 2; beta = 93.95° V = 274.82 Den(Calc)= 2.46
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.01(1), 4.06(0.5), 3.48(0.4),

Physical Properties of Searlesite

Help on Cleavage: Cleavage: {100} Perfect, {010} Distinct, {001} Distinct
Help on Color: Color: White, Light brown.
Help on Density: Density: 2.45
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luminescence: Luminescence: Fluorescent, Short UV=blue green, Long UV=orange.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Searlesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.215,KPDmeas= 0.2159,KC= 0.2181
Ncalc = 1.53 - 1.54
Help on Optical Data: Optical Data: Biaxial (-), a=1.515-1.524, b=1.531-1.533, g=1.535, bire=0.0110-0.0200

Calculated Properties of Searlesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.45 gm/cc
note: Specific Gravity of Searlesite =2.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESearlesite = 1.32 barns/electron
U=PESearlesite x rElectron Density= 3.23 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Searlesite is Not Radioactive

Searlesite Classification

Help on  Dana Class: Dana Class: (74)Phyllosilicate Modulated Layers
  (74.03)with joined strips
  (74.03.05)Na phyllosilicates Natrosilite Na2Si2O5 P 21/a 2/m Makatite Na2Si4O8(OH)2•4(H2O) P 21/c 2/m Silinaite NaLiSi2O5•2(H2O) A2/n 2/m Searlesite NaBSi2O5(OH)2 P 21 2
Help on  Strunz Class: Strunz Class: 09.EF.15 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EF -Single nets with 6-membered rings, � other rings
09.EF.15 Searlesite NaBSi2O5(OH)2 P 21 2

Other Searlesite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(www.saint-hilaire.ca;Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Searlesite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
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

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Dana No: Strunz No: 09.EF.15





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