| All granites are peraluminous as implied by the ubiquity of normative corundum. |
| The grayish-blue, partly gemmy cordierite, when first discovered in the early twentieth century, was mistakenly reported as corundum. |
| Reports of gem-quality corundum are rare in Wyoming, although both ruby and sapphire have been noted. |
| In Wyoming, corundum has been found in gneiss, pelitic schist, and vermiculite schist. |
| He also found particles of gemstones such as corundum, garnet, rutile, and argentite. |
| Chapters 2-19 describe eighteen specific traditional gemstones or families, beginning with corundum and ending with rhodonite. |
