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16hecenr ((TWIN CALCITE)), $40 MINIMUM BID, Montgomery County, Pennsylvania, 10 x 6 x 5 cm, Cabinet,

Here is an old William Jefferis 1820-1906 specimen from Pennsylvania. Jefferies hand written label numbered 7110. It is also from Carnegie Museum with label # 3941 with number painted on specimen. This is the specimen that matches the labels. The twinning can be seen in the orientation of the rhombs formed by the cleavage planes. All faces are cleavage faces.

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