Browse Items (1651 total)

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Kingdom: Animalia Phylum: Echinodermata Class: Echinoidea Subclass: Regularia Order: Family: Genus: Species:

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Rhodingitized gabbro dike in serpentinite. Chlorite, hydrogrossularia, diopside, prehnite, pumpellyite, vesuviane.

Hand Sample: Aphanitic, pink-black rhyodacite. Sample contains alternating black and dark pink bands across face. Sample does not contain any vesicles or phenocrysts.

Hand Sample: Holocrystalline fine-to-medium-grained phaneritic rhyolite with quartz, biotite, and plagioclase crystals generally no larger than 2mm. Weathers to brownish-orange.

Hand Sample: Porphyritic rhyolite with medium-grained potassium feldspar and plagioclase feldspar phenocrysts in a dark red-brown matrix. Weathers with an orangish tinge.

intrusive plug of quartz monzonite

flinty, columnar jointing, post-batholith volcanic

Phenocrysts of lath shaped feldspars and beta quartz

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"

from nearly vertical dike cutting quartz monzonite

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

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