Mindat Logo

Found in Niagara Falls, Ontario

Posted by Jonathan Robidas  
Found in Niagara Falls, Ontario
April 15, 2012 02:29AM
Found this at my place of work, less then 5km from Niagara Falls, I am a complete amateur when it comes to identification. Though I believe it may be quartz.

Any insight from the experts?

Its got some sparkle to it, and the drastic differences on each side has me confused. I am very curious to hear how you guys think it may have gotten this way.

Thank you all in advance
open | download - Rock1.jpg (146.4 KB)
open | download - Rock2.jpg (290.2 KB)
open | download - Rock3.jpg (190.6 KB)
Re: Found in Niagara Falls, Ontario
April 15, 2012 04:37AM
Slag from iron or steel production. it is very common and often mistaken for other rocks and minerals.

Re: Found in Niagara Falls, Ontario
April 15, 2012 05:53PM
Jonathan, where abouts in the Falls did you find the piece.. I know the area well, there were a few steel factories in the area many years ago and I know of some areas where slag was dumped..

Re: Found in Niagara Falls, Ontario
April 30, 2012 02:26AM
The first two pictures look like slag, the third one looks crystalline to me. Perhaps the specimen is a composite of slag with something else that did not melt in the furnace. Is there a distinct boundary between the two areas?
avatar Re: Found in Niagara Falls, Ontario
April 30, 2012 02:54AM
Hi Jonathan,

I also think the first two are probably slag. Your third image of a white columnar aggregate may be Tremolite. Compare here:
[www.mindat.org] If it is Tremolite, it may be fluorescent so if you have a SW or LW source you may want to check this. Good luck.



  • Valid attachments: jpg, gif, png, pdf
  • No file can be larger than 1000 KB
  • 3 more file(s) can be attached to this message

Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
Mineral and/or Locality  
Search Google  
Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: December 19, 2014 13:00:58
Mineral and Locality Search
and/or Locality:
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds