Marble

Title

Marble

Identifier

AD-7

Description

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

Date

1980

Contributor

Western Minerals Inc.

Spatial Coverage

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

Temporal Coverage

Precambrian

Accrual Method

Purchased from Western Minerals Inc.

Unit

Blue Mountain Lake Formation

Number of Thin Sections

1

Geolocation