Coal type

Locality/state

Ash (wt%)

Distribution of minerals in +1.5 g/cm³ fraction (%)

Anthracites:

Czech Rep.

2.98

-

Russia

2.66

-

Ukraine

3.46

-

Bituminous:

Dukla/CZ, fraction 1.27 - 1.33 g/cm³

2.39

Dolomite (33.1), kaolinite (26.8), goethite (17.3),

muscovite (13.3), quartz (9.5)

9.květen/CZ, fraction

1.24 - 1.29 g/cm³

1.05

Dolomite (47.2), calcite (21.4), kaolinite (11.8), quartz (8.9), pyrite (7.4), siderite (3.3)

Darkov/Czech Rep.

2.58

Dolomite (48.9), calcite (25.6), kaolinite (15.2), pyrite (6.2), siderite (4.1)

Paskov/Czech Rep.

1.49

Dolomite (59.6), calcite (28.9), pyrite (8.3), kaolinite (3.2)

Staříč/CZ, fraction

<1.30 g/cm³

1.80

Ferroan dolomite (55.5), calcite (26.6), siderite (7.7), pyrite (7.5), kaolinite (2.7)

Peak Downs/Australia

4.43

Quartz (81.0), kaolinite (19.0)

An Tai Bao/China

2.74

Calcite (65.2), pyrite (18.5), kaolinite (16.3)

Lignite:

ČSA/Czech Rep.

4.10

Quartz (39.2), gypsum (24.5), goethite (14.8), kaolinite (14.6), muscovite (6.9)

Gagatite:

Poland

1.51

-

Altered:

Kladno/Czech Rep.

4.40

Calcite (91.0), kaolinite (9.0)

Lazy/Czech Rep.

2.70

Dolomite (31.3), siderite (29.1), gypsum (17.6), pyrite (13.2), calcite (4.7), quartz (4.1)

Xylite:

Nová Ves/Czech Rep.

2.49

-