#grenville — Public Fediverse posts

The Montreal Gem and Mineral Show is happening at the end of the month in the main convention center (Le Palais des Congrès).

No guarantee of fantastic #Tugtupite or #Kyanite samples, but many others for sure. There's always a good representation of Canadian and Quebec localities.

#MinCup25 #Montreal #Quebec #Canada #MontSaintHilaire #Grenville #Minerals

This is one of the dykes found near Ayer's Cliff, just SE of Magog, Quebec. It's a set of three dykes, one of which has the deep-derived xenoliths. That one dyke (not photogenic) has weathered much faster, perhaps due to a higher carbonate content.
#kyanite #MinCup25 #Quebec #Xenolith #Grenville #Appalachians

Repost from last year: A titanite lozenge imaged both using a cellphone through the microscope ocular, and with a proper imaging system. It's surrounded mostly by quartz (+feldspar).
Likely from the Grenville, but from a teaching collection two generations of retired professors ago.

Titanite can be part of the record of temperature, pressure, and timing of crystallization.

#MinCup25 #Titanite #Grenville #Canada

Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")

Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.

From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)

#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville

Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")

Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.

From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)

#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville

Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")

Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.

From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)

#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville

Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")

Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.

From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)

#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville

Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")

Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.

From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)

#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville