#neptunite — Public Fediverse posts

#Benitoite, #Neptunite, #Djurleite and #Joaquinite
Photo by Kiyoshi Kiikuni
By #GeologicalWondersToo / Karen Kemp
#GeologyPage #Nature #Minerals #Crystals #Gems #Nature #NatureLovers #NaturePhotography #Photographer #RockPorn

@silicatefondue Always a big fan of a mineral that can be a handy reference for microanalysis! Vote #Neptunite!

#Neptunite can have solid solution substitutions. The photo below is of a manganese-rich neptunite from Mont Saint-Hilaire. Photo by dakotamatrix dot com
#MinCup23 #Quebec

I'm just a fool for dark bladed minerals. #Neptunite for me in this round of #MinCup23 .

#Neptunite is one of a few calcium-free titanium silicates (incl. benitoite). Seems like an obscure fact but:

#Zircon includes titanium in its structure, as a function of temperature; this can be a #geothermometer.

To standardize a microbeam analysis (like laser ablation ICPMS), we need a mineral with a known composition, lots of titanium and silica and no calcium, which has an isotope at mass 48. Neptunite and benitoite are perfect for this.

#MinCup23 #ICPMS #chemistry #geology

#MinCup23 #Arsenuranospathite vs #neptunite. Arsenuranospathite has a splendidly bonkers name, but I'm going for neptunite. The neptunite in this specimen in the #Hunterian museum collections, from San Benito, California, has a δ41K potassium isotope ratio of 0.21‰± 0.06. It's probably the only specimen of neptunite on Earth for which the potassium isotope ratio is known 😊 🤓 See https://pubs.rsc.org/en/content/articlelanding/2018/ja/c7ja00257b #Geology #Mineral #Isotopes

Folks, trust me, just vote #Neptunite over #Arsenuranospathite.
Save time. #MinCup23