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Reynolds Cup Reference Mixtures

The samples labeled with RCx_y are mixtures prepared from purified reference minerals, representing clay-bearing rocks, soils or raw materials in the broadest sense. The materials were designed for testing the performance of methods in qualitative and quantitative mineral phase analysis in previous Reynolds Cup contests

The organizers made great efforts to prepare homogeneous and well defined samples. However, as absolutely pure minerals are hard to obtain in amounts suitable for preparing some hundred grams of mixture, some minor impurities of the reference materials must be taken into account. Of course the degree of purity varies between the different reference materials, but in total the accuracy of the given mineralogical composition of a single sample can be estimated to be better than 1 % absolute bias. This means that the uncertainty of the percentage of a component should not be bigger than 1 % relatively for the major constituents and 0.1 % absolutely for the trace minerals.

The aliquots of the sample mixtures have been tested carefully for representativeness by XRF and XRD analysis. These data are available on request. But according to the limited amount of 2-4 grams, the delivered samples cannot be split further into subsamples without additional milling and homogenization.

Some samples contain sensitive minerals like bassanite, halite, pyrite or nahcolite as minor constituents. Their stability cannot be guaranteed during handling and long-time storage.

In general, please note that the mixtures are not prepared and checked in a complete procedure of certification. Therefore, there is no warranty for the trueness of the mineralogical composition as given in the data sheets. The Clay Minerals Society hereby explicitly excludes all responsibility for the usability of the mixtures in any calibration or test procedure.

Rate: US$ 250 per unit (2-4 grams)

Samples available:

RC5_1 Type: Clay-rich sediment from an evaporate environment

RC5_2 Type: Clay that might be encountered in a hydrothermal alteration

RC5_3 Type: Clay-rich soil formed on a parent material rich in ferromagnesian minerals and amorphous soil minerals

RC6_1 Type: Petroleum shale

RC6_2 Type: Ni laterite profile

RC6_3 Type: Bauxite profile

RC7_1 Type: Sulphate rock (Gypsifereous Keuper)

RC7_2 Type: Bentonite, sodium activated

RC7_3 Type: Kaolin clay

Mixture RC5_1

Type: Clay-rich sediment from an evaporate environment
Nominal composition:

Mineral

Mass%

Quartz

5.5

Albite

5.0

Calcite

6.0

Dolomite-ferroan

6.8

Magnesite

5.1

Anhydrite

5.2

Gypsum

5.1

Arcanite

2.7

Halite

2.9

Talc

11.8

Montmorillonite

5.1

Smectite (trioctahedral)

1.0

Corrensite

4.1

Sepiolite

18.7

Palygorskite

15.2

Mixture RC5_2

Type: Clay that might be encountered in a hydrothermal alteration
Nominal composition:

Mineral

Mass%

Quartz

2.2

Microcline

8.2

Albite

0.5

Gibbsite

9.6

Anatase

2.3

Calcite

0.1

Huntite

5.0

Barite

2.4

Barite Sr-rich

3.5

Alunite

10.7

Fluorite

1.9

Pyrite

0.1

Kaolinite (disordered)

14.3

Halloysite (10Å)

19.9

Illite-smectite (dioctahedral) I0.75/S0.25 R1

14.3

Muscovite 2M1

5.1

Mixture RC5_3

Type: Clay-rich soil formed on a parent material rich in ferromagnesian minerals and amorphous soil minerals
Nominal composition:

Mineral

Mass%

Quartz

9.7

Actinolite

4.0

Epidote

4.0

Goethite

7.8

Birnessite

2.0

Anatase

0.1

High Mg-calcite

9.0

Aragonite

3.0

Allophane

10.3

2-line ferrihydrite

7.9

Tourmaline

0.3

Talc

0.1

Kaolinite (disordered)

6.6

Mica (dioctahedral)

0.1

Saponite

5.1

Biotite

4.4

Vermiculite (trioctahedral)

11.2

Chlorite (trioctahedral)

14.2

Mixture RC6_1

Type: Petroleum shale
Nominal composition:

Mineral

Mass%

Quartz

11.1

Orthoclase

1.8

Albite

5.8

Pyrite

2.0

Halite

5.0

Calcite

9.7

Dolomite/ankerite

0.3

Mg-siderite

5.0

Barite (Sr)

4.0

Anatase

0.3

Kaolinite (ordered)

6.9

Montmorillonite

15.0

Illite-smectite (dioctahedral) I0.7/S0.3 R1 ordered

11.0

Illite 1Md (Fe-rich)

10.0

Muscovite 2M1

12.1

Mixture RC6_2

Type: Ni laterite profile

Mineral

Mass%

Quartz

16.3

Microcline

5.7

Orthoclase

0.1

Albite

4.8

Goethite

6.3

Hematite

9.4

Magnetite

5.3

Magnesite

5.2

Talc

5.0

Kaolinite (disordered)

7.4

Nontronite

13.6

Lizardite

7.7

Biotite

6.2

Chlorite (trioctahedral)

7.0

Mixture RC6_3

Type: Bauxite profile

Mineral

Mass%

Quartz

3.8

Goethite

5.7

Hematite

6.8

Magnetite

02

Gibbsite

10.7

Boehmite

7.6

Anatase

1.2

Rutile

3.8

Ilmenite

3.5

Zircon

2.9

Gamma-alumina

5.7

2-line ferrihydrite

5.6

Kaolinite (disordered)

13.2

Halloysite (7Å)

22.6

Muscovite 2M1

6.7

Mixture RC7_1


Type: Sulphate rock (Gypsifereous Keuper)
Nominal composition:

Mineral

Mass%

Quartz

5.1

Orthoclase/adularia

2.0

Albite

2.1

Oligoclase

1.0

Pyrite

1.9

Hematite

1.0

Gypsum

21.8

Anhydrite

22.7

Bassanite

1.1

Calcite

2.4

Dolomite

16.5

Magnesite

2.6

Rutile

1.1

Tourmaline

0.7

Apatite

1.1

Celestine

1.3

Amphibole (hornblende)

1.4

Ca-Montmorillonite

2.4

Illite-smectite (dioctahedral) I0.88/S0.12 R3 ordered

2.4

Muscovite 2M1

2.4

Biotite

1.2

Chlorite (trioctahedral)

5.8

Mixture RC7_2


Type: Bentonite, sodium activated
Nominal composition:

Mineral

Mass%

Quartz

7.3

Microcline

2.4

Orthoclase/adularia

3.4

Albite

6.2

Oligoclase

1.5

Pyrite

0.8

Gypsum

1.3

Calcite

2.5

Anatase

1.2

Rutile

1.2

Heulandite

2.2

Nahcolite

2.5

Cristobalite

3.9

silica

9.2

Ca-montmorillonite

29.4

Na-montmorillonite

10.8

Illite-cmectite (dioctahedral) I0.7/S0.3 R1 ordered

4.6

Illite 1Md

2.6

Muscovite 2M1

5.1

Chlorite (trioctahedral)

1.9

Mixture RC7_3


Type: Kaolin clay
Nominal composition:

Mineral

Mass%

Quartz

19.9

Orthoclase/adularia

4.0

Albite

2.0

Pyrite

1.8

Goethite

1.6

Hematite

1.4

Magnetite

1.0

Gibbsite

2.1

Boehmite

8.3

Anatase

3.0

Tourmaline

0.8

Zircon

1.2

2-line ferrihydrite

2.0

Kaolinite (ordered)

1.9

Kaolinite (disordered)

20.6

Halloysite (7«∫)

11.2

Ca-montmorillonite

2.7

Illite-smectite (dioctahedral) I0.7/S0.3 R1 ordered

5.0

Muscovite 2M1

8.2

Chlorite (trioctahedral)

1.5