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'Chalcedony'  | | | | Reference: | [Johnson, E.R.: Source Book For the Rock & Mineral Collector, 1960] |
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'Chalcedony var: Petrified Wood'  | | | | Reference: | [Johnson, E.R.: Source Book For the Rock & Mineral Collector, 1960] |
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'Coal var: Lignite'  | | | | Reference: | [Earth Treasures Vol 4, Allan W. Eckert, 1987] |
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Hematite  | | | | Reference: | [Earth Treasures Vol 4, Allan W. Eckert, 1987] |
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Limonite  | | | | Reference: | [Earth Treasures Vol 4, Allan W. Eckert, 1987] |
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Pyrite  | | | | Reference: | [Earth Treasures Vol 4, Allan W. Eckert, 1987] |
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Quartz  | | | | Reference: | [Johnson, E.R.: Source Book For the Rock & Mineral Collector, 1960] |
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