Na-Montmorillonite SWy-2 | SSHADE

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 $cm^{-1}$ ).

Owner of matter

Database

SSHADE

Matter origin

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

Geolocation

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))

Matter preparation and component types

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)

Matter shape and texture

Shape: loose powder
Texture: earthy
Type of porosity: open pores

Grains

Texture

clay-like

Grain sizes

Grains	Size min	Size max	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 composition

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

Materials in matter

Number

Mode of mixing

homogeneous mixing

Materials

Name	Arrangement	Mass fraction
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

Documentation, links and publications

Links

Clay Minerals Society

Publications