Steve, how did you know confidently the phenocryst is kaersutite ? What gave it away..? As ever, I'm overwhelmed and perplexed when it comes to ID'ing. :-)) Marg
Analysis that has been done in the past on these crystals Marg. Refer Zeolites of Victoria book. There are essentially five species of phenocrysts in these dykes, kaersutite, hydroxlapatite, biotite, anorthoclase, and rare zircons. It is easy to tell them apart visually.
Steve, how did you know confidently the phenocryst is kaersutite ? What gave it away..? As ever, I'm overwhelmed and perplexed when it comes to ID'ing. :-)) Marg
Analysis that has been done in the past on these crystals Marg. Refer Zeolites of Victoria book. There are essentially five species of phenocrysts in these dykes, kaersutite, hydroxlapatite, biotite, anorthoclase, and rare zircons. It is easy to tell them apart visually.
excellent thanks Steve, must get that book!
What a great name for someone! The name’s Rocks. Rusty Rocks.
😆
Have you looked at the basalt gravels of the railroad beds for zeolites? That can be fun
Sometimes, yes. Even better, looking for crocoite and other minerals that have fallen off railway wagons in western Tasmania!
Nice geology in this one . What type of rock is the “greenish dyke rock “?
The literature refers to them as "basaltic dykes".