Plutonic Rocks
Like the park, the collection largely contains plutonic rocks. The predominant rock type is granite, with a large variety representing the diversity of mineral composition and location. The collection also contains other kinds of granitic rocks from all over the park, including pegmatite and porphyry. In addition, the collection also has larger pieces of the minerals that form these rocks, such as quartz, scheelite, orthoclase, calcite, barite, and hornblende.