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Trade Classification of Stone Types - 2. Marble

Updated:2007-11-19 11:07:38

2 Marble

A metamorphic recrystallized rock composed of carbonate minerals (calcite or dolomite) or of serpentine, capable of taking a polish. The range of color and texture is wide. For soundness marbles are classified in 4 groups:

GROUP A

Sound marble with uniform and favorable working qualities; containing no geological flaws or voids.

GROUP B

Marbles similar in character to the preceding group, but with less favorable working qualities; may have natural faults; a limited amount of waxing, sticking and filling may be required.

GROUP C

Marbles with some variations in working qualities: geological flaws, voids, veins and lines of separation are common. It is standard practice to repair these variations using polyester resin, or epoxy liners and other forms of reinforcement when necessary.

GROUP D

Marbles similar to the preceding group, but containing a larger proportion of natural faults, maximum variations in working qualities, and requiring more of the same methods of finishing. This group comprises many of the highly colored marbles prized for their decorative value.

3.2.1 Dolomite marble contains in excess of 40% magnesium carbonate.

3.2.2 Dolomitic marble contains not less than 5%, not more than 40% magnesium carbonate.

3.2.3 Travertine marble - a porous or cellularly layered, partly crystalline calcite of chemical origin.

3.2.4 Serpentine marble (popularly called Verde Antique) a rock consisting mostly or entirely of serpentine (hydrated magnesium silicate), green to greenish black in color, commonly veined with calcite, and dolomite or magnesite, or both.

3.2.5 Onyx marble - translucent, generally layered cryptocrystalline calcite with colors in pastel shades, particularly yellow, brown, and green.

Marble supplied under ASTM C503 Standard Specification for Marble Dimension Stone (Exterior) shall conform to the physical requirements indicated in the following table:
 


source: www.buildingstoneinstitute.org

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