The Southland Geological and Lapidary Club had a field trip to Gemstone Beach this morning. I became a member when the Club was revived recently, despite the fact that I live in the North Island. The first Club meeting I attended six months ago is reported here. So I was pleased to be able to be take part in their field trip. About ten members were there, most of us not straying too far from the Taunoa Stream. I had some great chats with fellow stone enthusiasts from the Club. It was a warm and sunny morning, and the tide was retreating. When we finished up around 12 noon, there were lots of people in front of the carpark – it’s a popular beach.
In between chats, I picked up 50 stones to take away. Seven of them are featured below.
The first is an unusual stone. It is more glassy than it looks in the photos below. I initially thought it might be a glassy form of hydrogrossular garnet. A Club member, who is a geologist and works for a Museum, suggested it is chromite (chromium?) in quartz, a type of stone I have seen mentioned before.
A small thulite, with some tiny intense pink areas:
A kind of brecciated jasper:
A small black volcanic stone, maybe basalt, with interesting white crystals:
A very bright dark jasper that I found in the Taunoa Stream – one side has a chunk out it, a spoiler for a tumble polisher, but I couldn’t resist picking it up:
A much more subdued-hued pebble:
Finally, a busy trace fossil stone, both sides showing numerous traces:
A visit to Slope Point is the subject of the next Post. An Index to this Series is here.
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