Virginia Limestone & Calcite Freeform Pendant SS

Virginia Limestone & Calcite Freeform Pendant SS - 00383
[00383]

$30.00

Marble patterned Limestone & Calcite Freeform Pendant
Black limestone marbled with a white calcite creating some very interesting patterns. Polished all around with groove cut on side for wrapping. Wire is Sterling Silver
Collected from Barger's Quarry, near Lexington, Rockbridge Co., Virginia
Pendant size about 36x28 MM

"Sold without cord or chain"

Marble patterned Limestone & Calcite Freeform Pendant
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For custom cutting, wire wrapping, silversmithing send from the Contact Us page. - Thanks, David

Added to our rock_shop on Friday 14 May, 2010.

DESCRIPTION: Properties of calcite and dolomite, the chief mineral constituents of these rocks, precede general properties for the three rocks.
Calcite:
     Colors - colorless, white, gray, tan, reddish, bluish, greenish, lavendar, brownish or nearly black
     H. 3
    S.G. 2.71
    Light transmission - transparent to opaque
    Luster - pearly to vitreous
    Breakage - three perfect cleavages yielding rhombhedrons with angles of 75° or 105° between faces
    Miscellany - effervesces vigorously with dilute HCl (Hydrochloric acid); colorless grains can be seen macroscopically to exhibit double refraction.

Dolomite:
    Colors - colorless, white, gray, tan, reddish, bluish, or greenish
    H. 3½ - 4
    S.G. ~ 2.85
    Light transmission - translucent to opaque
    Luster - pearly to subvitreous
    Breakage - three poor-fair cleavages
    Miscellany - when powdered, effervesces slowly (so-to-speak smolders or simmers) when attacked by dilute HCl (hydrochloric acid); some dolomite is triboluminescent.
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Marble: Most marble consists of 90 percent or more of calcite or dolomite. As noted in the second paragraph under the OTHER NAMES subheading, the term marble has different connotations in geology versus the marketplace -- briefly, geologists consider it to be a metamorphic rock whereas marketers consider it to be any predominantly calcite- or dolomite-rich rock that takes a polish.
    Colors - white, brown, black and nearly every color; commonly streaked, mottled, variegated, etc. with one or more hues of one, two or more colors
    H. 3-4, depending upon composition
    S.G. 1.8-2.85
    Light transmission - translucent(in thin pieces) to opaque
    Luster - dull to pearly to subvitreous
    Breakage - irregular
    Miscellany - typically saccharoidal to relatively coarsely crystalline -- i.e., made up largely of grains a millimeter or more in greatest dimension. See NOTE following description of dolostone re distinguishing calcite from dolomite marbles.

Limestone: Limestones are sedimentary rocks, most of which are made up of 95 percent or more of calcite.
    Colors - diverse shades of gray (e.g., dove-gray), off-white; less commonly brownish or reddish; and rarely greenish
    H. 3
    S.G. 1.8-2.7
    Light transmission - translucent (in thin slices) to opaque
    Luster - dull to pearly(polished)
    Breakage - irregular to subconchoidal
    Miscellany - grains size is typically microscopic; see NOTE following description of dolostone

Geolology

Location: BARGER'S QUARRY near Lexington Rockbridge County, VA
Name: Limestone
Formation: Edinburg
Age: 450-480ma
Origin: Formed from organic processes in a shallow ocean environment. Uses: aggregate used in construction applications including; concrete, asphalt, block, erosion control, driveways. Can be used for acid neutralization in sous or streams as lime
The rocks in Bargers quarry consist of a sequence of thin- to medium- bedded carbonate rocks within the Liberty Hall Formation. The Liberty Hall is Middle Ordovician in age. Sediments that gave rise to this formation were deposited about 400 million years ago. Within the quarry, the rocks are mostly composed of argillaceous limestone with some shale. Fresh exposures are generally black, and weathered surfaces show a gray color. The beds within the quarry generally strike NE and dip moderately to steeply SE. The structural geology of the rocks in the quarry is relatively complex. Local folds and faults can be easily seen in the quarry walls. Some excellent pyrite crystals are associated with the folded rocks.

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