Browse Items (1651 total)

Hand Sample: Aphanitic grey-black color. Weathers to yellow-tan and orange. Small vesicles present.

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Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Ammonoidea Order: Family: Genus: Species:

Kingdom: Animalia Phylum: Mollusca Class: Cehpalopoda Subclass: Ammonoidea Order: Family: Genus: Species:

Macroscopic: Porphyroblastic amphibole in epidote, chlorite, and garnet calcsilicate rock. This sample represent the metamorphism of calcarious concretions in beds of quartzite to a schist. The formation this samples comes from has considerable…

Rock Sample:
The sample is very dark grey with light grey foliations.
The sample displays thin layering, some areas of chemical weathering, and microfoliations. It is aphanitic. There is quartz- like residue on the outside of the sample. It has…

Rock Sample: The color is a shiny dark grey with a bluish tint. Some parts of the sample are a more dark turquoise. Some faces are lighter and or darker than other faces. There is also a face with a brownish color and another face with a tannish…

Sample contains porphyroblasts of poikilitic hornblende. Thought to represent Na-rich volcanic units.

cummingtonite-poor, brownish-green hornblende dominated

(exotic block)

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…

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