Sue Courtney wrote:Ruby....a form of corundum (aluminium oxide)..............Garnet, in the gem world, is a cheaper stone than ruby, it often has flaws (cracks and inclusions of other minerals)
Olivine metagabbro. Olivine metagabbro is less abundant than granitic gneiss and metanorthosite, but numerous masses of this rock are scattered throughout the eastern and southeastern Adirondacks (see Plate 2). Like metanorthosite, olivine metagabbro commonly has textures that show its igneous origin. It also contains features called coronas (Figure 4.10), which show incomplete chemical reactions between minerals. These reactions happened during metamorphism, but so slowly that even in the millions of years before the rock cooled the original minerals were not wholly consumed. Near the edges of some olivine metagabbro bodies, we find spectacular large red garnets that also formed during metamorphism (Figure 4.11). At the Barton Mine on Gore Mountain near North Creek, garnets up to one meter in diameter have been found.
Howie Hart wrote:Sue Courtney wrote:Ruby....a form of corundum (aluminium oxide)..............Garnet, in the gem world, is a cheaper stone than ruby, it often has flaws (cracks and inclusions of other minerals)
Years ago I worked for an abrasive company, that manufactured not only the abrasive minerals, but finished products, such as sandpaper and grinding stones. One of the minerals they made was aluminium oxide (the other being silicon carbide). The synthetic aluminium oxide they produced was brown, but pure aluminium oxide is clear. Depending on contaminents present, it can be ruby, emerald, sapphire or other gemstones. We also made sandpaper from garnet, mined in upstate NY (Adirondac Mtns). This garnet was consistently orange. Just thought I'd share that.
Sue Courtney wrote:I don't believe we should be hanging on to the older meanings of words, such as garnet to indicate an older wine, just for the sake of it. It is up to the current generation of wine educators, wine writers, wine enthusiasts, people who post on wine discussion forums, to change the meanings of the historical words to have some bearing on the the real life parallels of todays drinkers. And this is why, when I describe a wine as garnet, I usually add a prefix of red-black, orange-red, almandine, pyrope, etc. And now after seeing those dyed beads, I will use purple-violet garnet more often too for a wine that is purple violet and has a gemmy appearance.
Victorwine wrote:My intent was to make a correlation between the colors of wine and that of gemstones, nothing more.
Mark S wrote:Perhaps we merely need to invent some new minerals
Sue Courtney wrote:I was alerted to a topic on the Colour of Wine on the Netscape Forum, and wished the topic had been posted here so I could join in (my problem with Netscape is another topic that is off topic here). Someone said they wished there was a poster/chart that listed all the colours of wine - well there is. I've seen it. It was in French and a limited edition poster put out by a wine company, whose name I can't remember right now. They also put out a poster of the tastes of wine. Both these posters consisted of rows and rows of glasses, with explanations in French (and possibly English) below each glass.
I would sure love a copy of each of these posters.
Users browsing this forum: Google [Bot] and 12 guests