Obsidian Group:
Black, Silver Sheen, Midnight Lace, Pumpkin Rainbow, and Red Mahogany.
The colors in obsidian result from the oxidation state of the chemical elements within the tiny minerals that are finely dispersed in the glass. Black color results chiefly from magnetite, Fe304. If the obsidian is highly oxidized, then the glass may contain hematite, which provides a reddish hue. Variations in the oxidation state of the iron (Fe) varieties imparts a slight greenish hue. Some obsidian is banded, a consequence of oxidation on a flow surface being folded into the lava as it continues to move.
Description: This grouping of Obsidian is found throughout the Great Basin Region.
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Raw Material |
Artifacts |
 Raw Nodule of Black Obsidian Natural Oxidation Patina |
  Obsidian Point Natural Chemical Patina 2-1/4" |
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Fresh Surface?-Actually I broke this 15 years ago- Looks like yesterdays break |
 Red Mahogany - Cascade |
Pictures by: Joel Castanza
