Limestone

Colors are typically gray, tan, or buff. A distinguishing characteristic of many limestones is the presence of shell and/or fossil impressions. (Sensitive to acidic solutions especially those with a polished, albeit, limestone will not take a high polish it is still sensitive to acid solutions.)

Type of Stone-Sedimentary
Category-Calcareous
Scratch Resistance-Low. Easy to repair.
Porosity-High
Acid Sensitivity- Highly sensitive.