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This boulder is from the interior of a hydrothermal quartz vein. Its texture is due to the crystallization of quartz

Slate is a fine-grained, foliated (layered) metamorphic rock that has a variety of commercial applications including blackboards, pool tables, roofing

This specimen from the Benner Hill Formation is a metamorphic rock containing alternating layers of quartzite and schist. Differential weathering

The Callahan Mining Corporation extracted copper and zinc ores from the volcanic rocks of the Castine Formation at the Harborside

Pillow basalts form when basaltic lava erupts underwater. The lava cools rapidly on all sides forming a pillow shape that

The unusual texture in this rock is an intergrowth of two accessory minerals: black schorl tourmaline and green flourapatite. Large

This is a giant crystal of microcline, which is the common variety of potassium feldspar. It’s the mineral upon which

Layering in this mildly metamorphosed rock is a particularly obvious because the dark-colored, calcareous metashale beds erode more easily than

This gray marble from the Coombs Formation is used for agricultural lime, cement, and concrete products. Marble quarrying in Maine

Jasper is a common lapidary material composed of very fine-grained quartz, and is used to make cabochons for jewelry. The