The set contains samples from each of the three classes of rocks; 21 in all. Size: 7″L x 3 1/2″W x 3/4″H.Contents: Igneous: basalt, dunite, pink and gray granite, obsidian, pumice; Sedimentary: chalk, coal, conglomerate, gypsum, ironstone, limestone, sandstone, shale, siltstone; Metamorphic: gneiss, marble, mica schist, quartzite, serpentine, slate.
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