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Apatite-(CaF): Ca5(PO4)3F Quartz: SiO2
Comments: Purple crystal of fluorapatite on slightly smoky quartz crystals. Former Dr. E.E. David and Houston Museum collections. Location: Pech, Kunar Province, Nuristan, Afghanistan. Scale: Crystal size 3.0 x 2.1 x 1.7 cm. © Ed Rosenzweig
Stilbite-Na: Na3Ca3[Al8Si28O72]·n(H2O) (n=28-32)
Comments: Stibite 'bow-ties' on matrix. Location: Cape Pula, Pula, Cagliari Province, Sardinia, Italy. Scale: Largest Crystal Length 3 cm. © Ed Rosenzweig