Marble

Marble

AD-7

This calcite marble is typical of most Adirondack metacarbonates. In the majority of instances, original dolomite has reacted to yield calcsilicates. Also present in these specimens are small, serpentinized droplets which may originally have been diopside or forsterite. Remnant grains of each of these minerals have been found in the marble. Accessory minerals are graphite, tourmaline, sphene, and sulfides. Adirondack marbles rarely occur by themselves. Rather, they tend to be interlayered with garnetiferous amphibolites similar to AD-10 (but not necessarily of igneous origin) and calcsilicates such as specimens AD-8 and AD-9. Quartzites and metapelitic layers occur with the marbles.
Thin section shows dolomite and serpentinized diospide

1980

Western Minerals Inc.

Adirondack Highlands-collected on NY Route 30 from a large road cut 3.1 miles east of Speculator, NY.

Precambrian

Purchased from Western Minerals Inc.

Blue Mountain Lake Formation

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