Polished Blue Lepidolite specimen BL239 #googleimages Porphyry is a general term

Porphyry is a general term that is used rather loosely for  igneous rocks which contain relatively large isolated crystals set in a fine-grained groundmass

Dimensions approximately 160 mm x 95 mm x 12 mm thick

Weighs 722 grams

Dimensions approximately 340 mm x 180 mm x 9

Dimensions at widest points approximately 105 mm x 80 mm x 6 mm thick

Polished Blue Lepidolite specimen BL239 #googleimages Porphyry is a general termBL239. Blue Lepidolite rough rock, cut and polished on one side with a natural weathered back. Dimensions approximately 100 mm x 80 mm x 25 mm thick Weighs 412 grams. Associated with quartz and feldspar. From near Yalgoo, Western Australia.