Browse Items (1651 total)

pillow lava metamorphosed to zone 2

other minerals found include sillimanite, kyanite, and corundum

This rock type is considered to be the most mafic of all units found in the entire White Mountain Batholith.

This sample is coarse grained and contains fayalite, ferrohedenbergite, and ferrohastingsite.

Sample found in massive slabby outcrops in the bed of the Sawyer River.

The granites at this locality are intruded by aplite dikes (WMB-6)

Sample intruded by Osceola granite (WMB-5). Sample contains bronze colored needles of astrophyllite associated with riebeckite.

fine-coarse grained pink granite

Sample found intruding into Conway Granite (WMB-7)

Sample from a ring dike and is fine-grained and quartz poor.

Coarse grained

Massive red granite. Grain size ranges from coarse to fine.

Green granite; contains hornblende and, locally, hastingsite, ferrohedenbergite, or fayalite

Volcanic unit that is part of a large block of float material in big brook which drains the middle Moat mountain.

Described as "comendite volcanics", these rocks are part of the "moat volcanic" series within the White Mountain Magma series. Also described as a "quartz porphyry"

Contains large phenocrysts of perthite. Rocks in the outcrop also contain abundant mafic xenoliths. Sample collected from a ring dike

The bulk of the rock contains quartz, k-spar, and amphibole.