Physical properties of stones – specific gravity of marble What is the typical specific gravity value closest to that of good quality marble?

Introduction:
Specific gravity is a key indicator of a building stone’s density and, indirectly, certain mechanical properties. For marble—widely used in flooring, cladding, and monumental work—knowing the typical range helps in selection and quality control on site and in specifications.

Given Data / Assumptions:

• We refer to calcitic marbles typically used in construction.
• Acceptable specific gravity range for marble is roughly around 2.65–2.75 depending on composition and porosity.
• We choose the option closest to a representative value.

Concept / Approach:

Marble is metamorphosed limestone dominated by calcite. The theoretical specific gravity of calcite is about 2.71. Commercial marbles hover near this figure, with minor variation due to impurities and void content. Hence, a value near 2.72 is a sound representative pick for good quality material.

Step-by-Step Solution:

Verification / Alternative check:

Handbooks and testing data for commercial marbles routinely indicate specific gravity values around 2.70–2.73, confirming 2.72 as a representative figure.

Why Other Options Are Wrong:

2.50 / 2.60 / 2.66: Lower than typical dense marble; may correspond to more porous or different rock types.

3.00: High for calcitic marble; closer to denser minerals/rocks.

Common Pitfalls:

Confusing marble with granite or dolomitic stones; ignoring porosity’s effect; assuming a single exact value rather than a representative range.

Final Answer:

2.72