Quartz with siderite - surroundings of Gourrama, Morocco
 
 Absolutely flawless, water-clear, 3.5 cm long quartz crystal with a great lustre on siderite. The transparency and clear crystal shape of the quartz form a special contrast to the rough surface of the siderite. The 5 cm x 3 cm specimen was found near Gourrama in Morocco, a historical find from the collection of Josef Kolb.