[Rockhounds] Morganites and beryls.

[larryrush at att.net]

Ed: As you know, the lack of color in beryl is a definitive indicator of the
variety called goshenite. I do not know what the coloring agent is for
beryl, but it seems reasonable to say that whatever that agent was at the
time of the beryl formation, it changed (or became absent) during
deposition. I once found a large beryl here in Conn. that was diagonally
separated by color,  pink on one half and green on the other. I am still
scratching my head about how that could have happened! I also have collected
beryls here which are completely colorless, and others which are pure white.
According to Dana, both are goshenites. To my mind, there is no reason why
goshenites should not have formed bi-colored, since it seems to be
relatively common for the species.

Larry


-----Original Message-----
From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On
Behalf Of EDWARD J WAGNER
Sent: Tuesday, September 26, 2017 11:25 PM
To: rockhounds at rockhounds.drizzle.com
Subject: [Rockhounds] Morganites and beryls.

Hello, list members. While recently looking at beryls identified as
morganites, I found one that raised an ID question. Altho the habit is the
flat, thin angles sides of morganite, the color went from being a white-ish
color more akin to goshenite, with the exception of one quarter, which had
an orange-ish color.  I am puzzled. Could this be a bi-colored morganite?
Perhaps it's a bicolored goshenite? What are, if any, the standard for
ID-ing this type of specimen? Many bi-colored beryls exist in Western NC,
especially green and yellow stones from Crabtree emerald mine. Any comments?
Thanks. EJWagner.

_______________________________________________
Rockhounds mailing list
Subscription Services:
http://rockhounds.drizzle.com/mailman/listinfo/rockhounds_rockhounds.drizzle
.com
List Usage Policy: http://Tomaszewski.net/Kreigh/Rockhounds/Rockhounds.shtml