URAL MINERALOGICAL FESTIVAL, July 3 to 21, 2019, in Yekaterinburg City, Ural region, Russia
Welcome to the GemologyOnline.com Forum
A non-profit Forum for the exchange of gemological ideas
It is currently Tue Jun 18, 2019 7:20 pm

All times are UTC - 4 hours




Post new topic Reply to topic  [ 13 posts ] 
Author Message
 Post subject: colored metals
PostPosted: Mon Jun 30, 2008 2:01 am 
Offline
Gold Member
User avatar

Joined: Mon Apr 16, 2007 12:05 am
Posts: 1452
Seeing the various threads about "white" gold made me recall an interesting fact that I thought I'd turn into a quiz question.

The periodic table of elements can be separated into metals and non-metals. Among the metals, only three reflect colored light. All the other metals appear silver or gray. Two of these color-reflecting metals are gold and copper. What is the third? :)

And if you are thinking "brass"... :( sorry, that isn't an element, it is an alloy of zinc and copper whose color reflection comes from the copper.

Sorry, no prize for correct answer. :cry:


Last edited by Brian on Mon Jun 30, 2008 8:44 am, edited 1 time in total.

Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 3:53 am 
Offline
Gold Member

Joined: Thu Apr 17, 2008 1:47 am
Posts: 1322
Location: Pacific Northwest
OK, I'll bite. It either has to be silver (white) or bismuth (pink) depending on your definition of "color".
Clearly I had to search the periodic table to come up with bismuth. Not even sure what it is used for but certainly not jewelry.

_________________
I just dreamed that I was a butterfly.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 6:31 am 
Offline
Gemology Online √úbergod
User avatar

Joined: Tue Aug 01, 2006 3:24 am
Posts: 4997
Location: McDonough GA
I"m going with Bismuth too.

J-

I WANT A PRIZE! :D How bout a free spectrometer? hehe

_________________
http://www.selectgem.com


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 8:44 am 
Offline
Gold Member
User avatar

Joined: Mon Apr 16, 2007 12:05 am
Posts: 1452
Nope.

I have some bismuth shot (a nice replacement for lead shot if you are an eco-friendly fisherman), and it is pretty much gray. And silver is pretty much silver.

This metal element has an unmistakable color.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 9:08 am 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7497
Location: Rome, Italy
Cesium?

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 9:58 am 
Offline
Valued Contributor
User avatar

Joined: Mon Nov 05, 2007 8:01 pm
Posts: 235
After a bout of periodic table reading, I'll bet on osmium, described as blue/grey or blue/black.

Doesn't sound promissing, I know.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 10:04 am 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7497
Location: Rome, Italy
Tantalium is described like bluish-gray.....

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 10:43 am 
Offline
Gold Member
User avatar

Joined: Mon Apr 16, 2007 12:05 am
Posts: 1452
Alberto wins with his first answer. Cesium. :smt038


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 11:02 am 
Offline
Site Admin
User avatar

Joined: Fri May 12, 2006 11:24 am
Posts: 7497
Location: Rome, Italy
ok Prof,
i hope i won more answers on spectrometer setup 8)
ciao
alberto

_________________
GemmoRaman-532 - GemmoFTIR - GemmoSphere - EXA


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 2:21 pm 
Offline
Gold Member

Joined: Thu Apr 17, 2008 1:47 am
Posts: 1322
Location: Pacific Northwest
Descriptions from the periodic table (Wickepedia):

Bismuth- lustrous pink
Cesium- silvery gold
Silver- lustrous white

Maybe your Bismuth fishing weights are not pure Bismuth?

_________________
I just dreamed that I was a butterfly.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 4:20 pm 
Offline
Gold Member
User avatar

Joined: Fri Oct 19, 2007 5:04 pm
Posts: 1605
Location: Walnut Creek, CA
In some metals the "color" is due to a film of the metal oxide in the surface. I think the most "famous" is titanium: you can get a variety of colors varying e.g. the oxide film thickness, but the metal itself is gray.
With Bi the situation should be very smilar.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Mon Jun 30, 2008 10:16 pm 
Offline
Gold Member
User avatar

Joined: Mon Apr 16, 2007 12:05 am
Posts: 1452
Just because you find a piece of iron with orange coloring on its surface doesn't mean that iron is orange. Similarly, bismuth may in some cases have a pink coloring on its surface, but the metal itself is pretty much gray.


Top
 Profile  
Reply with quote  
 Post subject:
PostPosted: Tue Jul 01, 2008 4:08 pm 
Offline
Gold Member
User avatar

Joined: Fri Oct 19, 2007 5:04 pm
Posts: 1605
Location: Walnut Creek, CA
Brian wrote:
Just because you find a piece of iron with orange coloring on its surface doesn't mean that iron is orange.


That's why I put "color" between quotes :)


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ] 

All times are UTC - 4 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Gemology Style ported to phpBB3 by Christian Bullock