The Dependency of Diffusion Coefficients and Geometric Factor on the Size of the Diffusing Molecule: Observations for Different Clay-Based Materials

Table 2

Quantitative mineralogical composition of the different samples (in mass%) and the specific surface area (m²/g). Minerals which were below the detection limit are indicated with BD.

	Boom Clay			Eigenbilzen Sands			Bentonite	COX	OPA
	Core 84b K2	Core 127b K4	Core 36a K14	Core 37b K15	Core 35b K16	Core 39b K17
Quartz	31	28	59	58	60	54	3	24	28
K-feldspar	8	5	8	9	10	8	BD	5	3
Plagioclase	3	1	6	6	5	5	3	3	BD
Calcite	0.2	2	BD	BD	BD	BD	BD	21	8
Ankerite/dolomite	BD	BD	BD	BD	BD	BD	BD	4	BD
Pyrite	2	2	0.6	0.5	1	0.5	BD	1	0.6
	0.6	0.5	1	1	0	0	BD	BD	BD
Anatase	0.6	0.7	BD	BD	BD	BD	BD	BD	BD
Kaolinite	8	9	2	4	2	3	BD	0	BD
2 : 1 Al clay	34	41	20	18	21	27	93	39
Muscovite	9	8	BD	BD	BD	BD	BD	BD	BD
Chlorite	2	2	3	3.5	0	2.5	BD	3	BD
Opal A	2	1	BD	BD	BD	BD	BD	BD	BD
Specific surface area	38	45	14	12	8	20	+	28	21

is a secondary phase; it is an oxidation product of pyrite after exposure of the sample to air; value contains all clay minerals (counted together); measured.