Browse Items (1651 total)

Ankaramites are dark porphyritic basalts that contain abundant pyroxene and olivine phenocrysts. Lesser amounts of biotite, and plagioclase may also be present.

possibly crystal tuff

Rock Sample:
The color is mainly blue and black. The sample is aphanitic and the cross section of the sample reveals very fined grained phenocrysts (~1mm in diameter). The colors of the phenocrysts range from white, blue, black, or green.
It has…

pre-batholith volcanic

1:24000

1:24000

1:24000
comes with full-sized sheet detailing units and structure

1:24000
comes with full-sized sheet detailing units and structure

Macroscopic: Andalusite, biotite, garnet, muscovite, chlorite schist. Heavily weathered exterior due to divets and altered nature. High abundance of foliated mica. Microscopic: The andalusite, biotite, and garnet are porphyroblastic with andalusite…

Macroscopic: An andalusite, biotite schist with large and abundant garnet porphyroblasts. Low grade of metamorphism. Microscopic: Large andalusite and cordierite phenocrysts within very fine grained matrix. Thin section pictures in XPL unless…

Mica schist containing coarse (altered) andalusite crystals

Mica-based schist containing porphyroblasts of andalusite (chiastolite) which have been partly retrograded to muscovite

1:62500

1:62500

Rock Sample:
The sample is a dark greenish blue with brown layering. On one side of the sample there is a sand-like residue that is tan in color. The sample is aphanitic and possesses micro-folds. The sample appears to have experienced some…

(exotic block)

cummingtonite-poor, brownish-green hornblende dominated