Search Results for: Not broken linseed
will be swirled together in a single specimen. the most common color combination is black and brown obsidian swirled together - that's called "mahogany obsidian" (see photo). as a "glass," obsidian is chemically unstable. with the passage of time, some obsidian begins to crystallize. this process does not
altered by weathering, heat, or other processes. significant deposits of obsidian are found in argentina, canada, chile, ecuador, greece, guatemala, hungary, iceland, indonesia, italy, japan, kenya, mexico, new zealand, peru, russia, united states, and many other locations. in the united states it is not...
https://geology.com/rocks/obsidian.shtml