the minerals form in very thin sheets. from a central point like the spokes of awheel. ...cm Ye 4m Quartz (smoky variety), St. Gotthard, Ticino, Switzerland « 4x 8 x 5 om MINERALS: PRODUCTS...13 x 6.5 x 4om Four Cleavage Planes Copper, Central Mine, Michigan, USA 7x Wx 4em Stibnite, Ichinokawa...British Columbia, Canada * 7.5 x 1.5 x 75 cm Europe: St. Just and Redruth, Cornwall, England; Dognacska (Dognecea)...Ontario. Europe: Wheal Cock and Botallack mines, St. Just, Cornwall, England; Tunaberg, Sédermanland |