Browse Items (1651 total)

Kingdom: Animalia Phylum: Mollusca Class: Gastropoda, Bivalvia  Order: Family: Genus: Species:

Ichnogenus:

This specimen is typical of the olivine metagabbros that occur throughout the Adirondacks. These rocks are of great petrologic interest for they contain classic examples of garnet coronas and spinel-clouded plagioclase. Note the preservation of…

This rock type is characteristic of the light colored layers in the Sacandaga Formation. The mineralogy consists of garnet, feldspar, and quartz. Occasionally, sillimanite and skeletal oxides occur. Both plagioclase and microcline are present. Quartz…

This specimen is similar to the famous garnet deposits at Barton Mines at Gore Mountain. The garnets at Gore Mountain can attain diameters of 3 feet. At the Speculator road cut, garnet of 8-10 inches in diameter have been found, but smaller examples…

Garnet-rich quartz monzonite from the Kinsman Quartz Monzonite. Garnets are replaced partly by biotite. Some of the garnet forms pods and boudins. Similar sample to NH-9.
Hand sample shows large biotites, plagioclase, and quartz.
Thin section…

Macroscopic: Garnet-muscovite bearing granitic pegmatite. Visible, green beryl may be present as beryl is often associated with pegmatites. The mineralogy is typical of sedimentary protolith granites which supports the hypothesis that the basement of…

Macroscopic: Biotite, muscovite schist. The biotite has begun retrograding to chlorite. There is a mineral zone consisting of garnets present in the handsample. Microscopic: Abundant foliated biotite/sericite and quartz. Large amphibole phenocrysts…

Macroscopic: Grey garnet, biotite and chlorite bearing quartzite. Likely protolith is a low-Al quartz-rich sandstone bed. Microscopic: Abundant quartz crystals accompanied by chlorite and biotite. Thin section pictures in XPL unless otherwise noted…

(exotic block)

Not dark phonolite facies

Micaceous schist containing porphyroblasts of garnet and staurolite.

Grade bedded layers of pelitic bands and thin sandstones

Garnets and chlorite in pelitic bands

Not as messy as garnet psuedolucite syenite at Diamond Joe Quarry

Phyllite containing porphyroblasts of garnet

Coarse, with white veins and orange coloration