THE MINERALS OF THE CLYDE DRAINAGE AREA. 549 



CHLORIDES AND FLUORIDES. 



22. Halite (common salt), NaCl Only obtained in the district by the evapor- 



ation of sea-water. 



23. Fluorite, CaF 2 Gourock : Broadstone : Waiilockhead : in clear 



crystals at Waterland, Lugton. 



OXIDES. 



24. Quartz (Rock Crystal), SiO 2 In fine crystals at Leadhills : Campsie Hills : 



Gourock : Cathkin : and other locnlities. In minute double-ter- 

 minated crystals in sooty coal at Kilwinning, and in microscopic 

 crystals from Carbonite (columnar coal) from Paisley, Provanhall, 

 and other places where a coal-seam has been altered by intrusive 

 Dolerite. 



The following varieties and localities may also be noted : Amethystine 

 Carrickshore : Leadhills : Langbank : Galston : Dairy Hills : Cath- 

 cart Castle. Milky Galston. Ferruginous Bute : Stockie Muir. 

 Calcedouy - -Galston. Cornelian -- Cantyre. Agate -- Galston. 

 Agate- Jasper Dunglass : Galston. Plasma Kilwinning. Jasper 

 Burn Ann : Galston : Spout of Ballagan : Lendalfoot : Dunglass. 

 Flint Beith : Dunoon. Heliotrope Cantyre. Smoky Arran. 

 Quartzyte Campsie : Black Craig : Argyllshire. 



25. Opal, SiO 2 with water Corrie Glen. 



26. Valentinite, Sb.,O 3 New Cumuock. 



27. Cervantite, Sb. 2 O 4 Hare Hill. 



28. Water, H 2 O In abundance in the liquid form everywhere 



in the district and in the crystalline form as Snow and Ice in winter. 



29. Cuprite, Cu 2 O Waiilockhead. 



30. Tenorite or Melaconite, CuO Leadhills. 



31. Haematite, Fe 2 O 3 Leadhills : Loch Doon : Kilbirnie Hills. 



32. Reddle, Fe 2 O 3 a variety of 



Haematite Dairy. 



33. Ilmenite or Menaccanite, FeTiO 3 Holy Loch : Glen Massan : Bute : 



Cantyre : Loch Long. 



34. Picotite Chrome Spinel, (Mg. Fe)O(AlCr) 2 O 3 as a constituent of some 



volcanic rocks. 



35. Magnetite, FeO . Fe 2 O 3 Bute : Loch Long : Logan Water. 



36. Minium, Pb 3 O 4 Leadhills. 



37. Rutile, TiO 2 Cowal district. 



38. Plattn^rite, "PbO 2 Leadhills: Waiilockhead. 



39. Octahedrite, TiO 2 Earn, W. of Loch Lomond. 



40. Pyrolusite, MuO 2 From dredgings in Loch Fyne : Leadhills. 



41. Gothite, Fe. 2 O 3 H 2 O Kilpatrick Hills : Gourock. 



42. Limonite, 2Fe 9 O 3 3H 2 O Lochnne : Mull of Cantyre. 



43. Psilomelane, H 4 MnO 5 Kilpatrick Hills : Leadhills. 



44. Wad Bog-Manganese. Composition variable but chiefly an oxide of 



Manganese. Gourock : Renton : Cathkin : Bowling : Leadhills : 

 Burrmill. 



45. Asbolite. A variety of Wad containing Oxide of Cobalt. Tyndrum. 



OXYGEN-SALTS CARBONATES. 



46. Calcite, CaO 3 In many crystalline forms; the ordinary 



rhombic ; Dog-tooth and Nail-head, at Dockra : Gourock : Campsie 

 Hills : Dairy : Waterland : Leadhills : Barrhead : and as Limestone 

 at Beith : Campsie Hills : Nitshill : as Rock-Milk at Cleaves Cove, 

 Dairy : Pink crystals occur at Gourock. 



