Searlesite Mineral Data + 
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- 74.3.5.1 Natrosilite Na2Si2O5 P 21/a 2/m
- 74.3.5.2 Makatite Na2Si4O8(OH)2·4(H2O) P 21/c 2/m
- 74.3.5.3 Silinaite NaLiSi2O5·2(H2O) A2/n 2/m
- 74.3.5.4 Searlesite NaBSi2O5(OH)2 P 21 2
- VIII/G.05-05 Silinaite NaLiSi2O5·2(H2O) A2/n 2/m
- VIII/G.05-10 Searlesite NaBSi2O5(OH)2 P 21 2
- VIII/G.05-20 Makatite Na2Si4O8(OH)2·4(H2O) P 21/c 2/m
General Searlesite Information |
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 Chemical Formula: |
NaBSi2O5(OH)2 | ||
| 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 | |||
| Empirical Formula: |
NaBSi2O5(OH)2 | ||
| Environment: |
Continental alkaline evaporite deposits and alcalic-pegmatites. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1914 | ||
| Locality: |
Searles Lake, San Bernardino Co., California. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named after it's locality. | ||
| Synonym: |
ICSD 12134 | ||
| PDF Jun-37 | |||
Searlesite Image | |||
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Images:
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Searlesite Crystallography |
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| Axial Ratios: |
a:b:c =1.1304:1:0.6948 | ||
| Cell Dimensions: |
a = 7.972, b = 7.052, c = 4.9, Z = 2; beta = 93.95° V = 274.82 Den(Calc)= 2.46 | ||
| Crystal System: |
Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 21 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 8.01(1), 4.06(0.5), 3.48(0.4), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Searlesite |
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| Cleavage: |
[100] Perfect, [010] Distinct, [001] Distinct | ||
| Color: |
White, Light brown. | ||
| Density: |
2.45 | ||
| Diaphaniety: |
Transparent to translucent | ||
| Habit: |
Fibrous - Crystals made up of fibers. | ||
| Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) | ||
| Habit: |
Spherical - Spherical, rounded aggregates. | ||
| Hardness: |
1-2 - Between Talc and Gypsum | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous (Glassy) | ||
| Magnetism: |
Nonmagnetic | ||
| Streak: |
white | ||
Optical Properties of Searlesite |
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| 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 |
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| 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 |
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| Electron Density: |
relectron=2.45 gm/cc |
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| Fermion Index |
Fermion Index = 0.02367 Boson Index = 0.97633 |
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| Photoelectric: |
PESearlesite = 1.32 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Searlesite is Not Radioactive |
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Searlesite Classification |
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| Dana Class: |
74.3.5.4 (74)Phyllosilicate Modulated Layers | ||
| (74.3)with joined strips | |||
| (74.3.5)Na phyllosilicates | |||
| Strunz Class: |
VIII/G.05-10 VIII - Silicates | ||
| VIII/G - Intermediate between chain- and layered silicates | |||
| VIII/G.05 - Silinaite - Makatite series | |||
Other Searlesite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| 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 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris Search for Searlesite using: Visit our Advertisers for Searlesite : Translate Searlesite Mineral Data : Ask about Searlesite here : Print or Cut-and-Paste your Searlesite Specimen Label here :
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