Obsidian Rock
Hello. My step dad who was a well known oil industry geologist in Kansas and several surrounding states, gave me this sample of obsidian. He said that he had purchased it from an unknown person. He said that it was worth several thousand dollars. At least that's what my mom said after his death in 2021. That said, I would like to get verification of its value and possible contacts in our area, if you can provide any, of possible buyers.
About 17" x 17" x 9"
Inherited
Yes
Mahogany Obsidian Raw Stone
Unknown age
Unknown excavation source (possible North America; United States; SW and West coast)
Measurements: 17" x 17" x 9", weight not given*
From images I believe this to be a, uniquely, larger section of mahogany obsidian. It is a common variety of obsidian; identifiable by the red and brown stripe coloration. While some specific pieces or locations may have limited quantities, it is generally considered a readily available stone for collectors and hobbyists in lapidary and flintknapping.
All obsidian is a formation of volcanic glass reacting with the minerals in the area of impact. Mahogany Obsidian is classified by the color created by iron impurities, such as hematite and magnetite, within the rapidly cooled lava.
In science fields Obsidian Hydration Dating is important. It is a relatively inexpensive method for dating obsidian artifacts such as flints and arrowheads. It also provides archaeologists and geologists ages for sites where organic materials suitable for radiocarbon dating may be scarce. OHD measures the hydrated layer that forms on the surface of volcanic glass tools over time as they absorb water from the atmosphere.
Preservation: Obsidian is a natural forming glass, and rates soft on the Mohs hardness scale for gem strength. The absorption of water occurs over thousands of years. However, I do suggest a museum or metal mount for your example to maintain its current condition and form.
Sale suggestions:
With this assessment and the images you have provided you could look into the following:
1. Mearto works with Catawiki for online sales. This link will let them know I referred you. https://prf.hn/click/camref:1101lHtv3/pubref:amber
2. A regional auction house specializing in natural history may be a great in-person assessment and option for auctioning your item. I do not know Kansas regional auction businesses or market credibility. I suggest reaching out to your University system's Natural History Museum: https://biodiversity.ku.edu/
3. A list of Kansas based gem and mineral societies. These clubs often host sale/shows and may suggest possible interested parties: https://www.rockandmineralshows.com/location/rock-clubs/kansas
*Weight should be given in future sale considerations.
