Matter
Name
Na-Montmorillonite SWy-2
Family
Family
solid
Comments
Impurities (13.3% wt.%) in the fraction < 2µm: 5.2% Quartz, 0.1% Plagioclase, 0.4% Calcite, 0.2% Dolomite, 1.3% Kaolinite, 0.2% Chlorites, 4.4% Clinopyroxenes, 1.4% Orthopyroxenes (Vogt et al. 2002). INFRARED SPECTROSCOPY: Typical spectrum for Wyoming bentonite with a moderateFe+3 content (band at 885 $cm^{-1}$). Quartz is detectable (band at 780, 800, 698, 400, and 373 $cm^{-1}$), a trace of carbonate (band at 1425 $cm^{-1}$).
Database
Origins
natural terrestrial
Provider
Source Clays Repository - The Clay Minerals Society, Purdue University, West Lafayette, IN, USA
Provider reference code
SWy-2
Local reference code
Smectite CMS SWy-2
Body name
Earth
Place
Newcastle formation (cretaceous), County of Crook, State of Wyoming, USA
Image
Pictures of the 6 grain size fractions of SWy-2 smectite particles taken under a binocular microscope at three different zoom levels (zoom level increases from left (5mm FS) to right (1mm FS))
Preparation
raw
Method
Wyoming bentonite. Collection in June 1993 from a stockpile of very recently mined clay. The American Colloid Company donated the sample
Phase type
solid
Component type (group)
mineral (silicate mineral), mineral (non-silicate mineral)
Shape
loose powder
Texture
earthy
Type of porosity
open pores
Texture
clay-like
Grain sizes
Grains Size min Size max Size median Size width Size mass fraction Grain shape
#1 0.0 ${\mu}m$ 25.0 ${\mu}m$ aggregate
#2 25.0 ${\mu}m$ 50.0 ${\mu}m$ aggregate
#3 50.0 ${\mu}m$ 100.0 ${\mu}m$ aggregate
#4 100.0 ${\mu}m$ 200.0 ${\mu}m$ aggregate
#5 200.0 ${\mu}m$ 280.0 ${\mu}m$ aggregate
#6 280.0 ${\mu}m$ 400.0 ${\mu}m$ aggregate
Size method
from dry sieving without grinding (fractions not measured)
Comments
weakly consolidated aggregates (of < 2µm particles) with complex shape often elongated and relatively far from spheroids
Oxides
Formula $SiO_{2}$ $Na_{2}O$ $CaO$ $K_{2}O$ $Al_{2}O_{3}$ $Fe_{2}O_{3}$ $FeO$ $MnO$ $MgO$ $TiO_{2}$ $P_{2}O_{5}$ $CO_{2}$ $F$ $S$
Mass fraction (%) 62.9 1.53 1.68 0.53 19.6 3.35 0.32 0.006 3.05 0.09 0.049 1.33 0.111 0.05
Oxides comments
Global analysis of the SWy-1 clay collected earlier at the same location
Number
11
Mode of mixing
homogeneous mixing
Materials
  Name Arrangement Mass (g) Mass fraction Abundance comments
Na-Montmorillonite with adsorbed and interlayer water homogeneously mixed (with interlayer and adsorbed water) 0.75 $\pm$ 0.02
Quartz homogeneously mixed 0.08 $\pm$ 0.01
Plagioclase homogeneously mixed 0.16 $\pm$ 0.02
Gypsum homogeneously mixed 0.005 $\pm$ 0.003
Calcite homogeneously mixed 0.007 $\pm$ 0.003
Illite homogeneously mixed 0.002 $\pm$ 0.002
Dolomite homogeneously mixed 0.002 $\pm$ 0.002
Kaolinite homogeneously mixed 0.013 $\pm$ 0.01
Chlorites homogeneously mixed 0.002 $\pm$ 0.002
Clinopyroxenes homogeneously mixed 0.044 $\pm$ 0.04
Orthopyroxenes homogeneously mixed 0.014 $\pm$ 0.01
Links
Publications