#fluorapatite can be used for dating geo processes; not only by the accumulation of radiogenic isotopes, but also from the accumulation of damage from the fission of uranium. Mary Roden-Tice (SUNY Plattsburgh) showed that the rocks in the Adirondack portion of the Grenville were near the surface (<100°C) by the Cretaceous (~100 million years ago).
Roden-Tice et al., J. Geology (200). (Mary has since passed away).
#MinCup23 #Adirondack #NewYork #Geology

#Fluorapatite on orange #caclite from the Yates mine, northwest of #Ottawa. It records the passage of water-rich, silicate-rich, and carbonate-rich fluids (melts) more than a billion years ago, under the Himalayan-scale mountains of the Grenville. #MinCup23

I'm leaning towards fluorapatite but will accept convincing either way. Feel free to explain why #fluorapatite or #zircon is a better choice for this round of #mincup23 voting.
https://mastodon.social/@MineralCup/110998058838272417

Okay so #fluorapatite sounds like it should be chaos (shark teeth!) but really how much more controlled do you get than regularly regrowing all your teeth? (And why isn't that a thing humans retained when we evolved? Think of the $ we'd save on dental bills!)

#Zircon tho. My understanding is Zircon sure has given scientists some fun times figuring out how it even WORKS re background radiation of the universe and time. Also, Dr who = Time Lord = peak chaos. Vote Zircon! #MinCup23

#DoctorWho fans! Zircon needs your help. #TeamZircon.

QT: https://mastodon.social/@MineralCup/110998058838272417
MineralCup@mastodon.social - Tick-took, tick-tick, it’s time to break your heart with #MinCup23 Round 1 Match 3: #Fluorapatite v #Zircon!

It’s shiny shark teeth vs the Time Lord. You have 24 hours.

Vote: https://www.mineralcup.org/2023/campaigns/round-1-match-3

Check results: https://www.mineralcup.org/results/round-1-match-3

RT @MineralCup@twitter.com

ROUND 1 MATCH 2

It’s a battle of gems as shiny shark tooth #Fluorapatite faces down deep green imperial #Jadeite.

We all love beautiful rocks, but only one can continue for #MinCup2022. Which will it be?

You have 24 hours. Teach, learn, argue, and VOTE!