Along with the quartz, orthoclase felspar is sometimes seen. No doubt, both the quartz and felspar are derived from veins in the granite, which outcrops in most places fossickers go.
Black spinel (pleonaste, blackjack), corundum (a high proportion of which is gem quality sapphire), zircon and pyrope garnet are found everywhere. Sometimes the vagaries of the currents during floods cause the zircon and garnet to be concentrated separately, though always with spinel and corundum.
The less common minerals,but still common enough to be found every visit or so, are enstatite and schorl tourmaline. Topaz is found once in a while, perhaps one or two pieces in a year of regular weekly outings. Once a blue specimen was found. Just once a pale specimen of ruby turned up in my sieve, and this has already been illustrated in the blog entry on pink sapphires.
Finally, there are the miscellaneous things that turn up, which, while not all one-offs, will bother most
|Carnelian 3cm across|
|Silicified wood 11cm long|
|Rutile 2cm long|
Lastly, here is a specimen about which I know nothing. It was found amongst the sieve concentrates, so it's reasonably dense. It doesn't look like the rest of the corundum, which I thought it was initially. It remains a mystery mineral.
Check my gem hunting videos from around Glen Innes here . I also have playlists on Glen Innes, the Blue Mountains and New Zealand.
|The mineral we all want to find: 16.8 carat blue sapphire|