Related by context. Frequent words. (Click for all words.) 65 malachite 65 tourmaline 62 olivine 62 galena 62 jasper 59 garnet 58 feldspar 58 hematite 58 pegmatite 58 siliceous 58 sapphires 58 topaz 57 iron oxides 57 calcite 57 amethyst 56 quartz 56 granites 56 sphalerite 56 quartzite 55 chert 55 bornite 55 chalcocite 55 apatite 55 opals 55 mudstone 55 citrine 55 disseminated sulphides 54 disseminated pyrite 54 chlorite 54 emeralds 54 gemstone 54 mica 54 arsenopyrite 54 molybdenite 54 gemstones 54 Niobium 53 potassic alteration 52 basalts 52 chalcopyrite 52 kimberlite pipes 52 massive sulphides 52 @ #.#g t [004] 52 opal 52 carbonatite 52 pyrrhotite 52 sulphides 52 alluvium 52 sulphide bearing 52 ultramafic rocks 52 lithologies 52 iridium 52 outcrops 52 limonite 52 banded iron 52 sulfides 52 diamondiferous 51 sulphide mineralization 51 kimberlite 51 semi precious stones 51 Ni Cu 51 iridescence 51 copper Cu 51 gneiss 51 quartz veins 51 obsidian 50 igneous 50 mineralogy 50 quartz veining 50 kimberlite pipe 50 ruby 50 auriferous 50 veining 50 quartz crystals 50 silicates 50 petrified wood 50 russet 50 carat stone 50 gossan 50 carat 50 basalt 50 gravels 49 skarn mineralization 49 sulfide 49 Au Ag 49 felsic 49 veinlets 49 pyrite 49 stud earrings 49 sulfide mineralization 49 syenite 49 niobium 49 limestones 49 t Au 49 sandstones 48 stockworks 48 tuffs 48 carbonaceous 48 graphitic 48 silicification 48 diamonds 48 facies