Rotten stone, sometimes spelled as rottenstone, also known as tripoli, is fine powdered porous rock used as a polishing abrasive for metalsmithing and in woodworking.

Properties

Chemical formula

KAl₇(NO₃)₄(OH)₁₆Cl₂ * 8H₂O

Group

Oxides

Crystal system

Monoclinic

Hardness (Mohs)

—

Color

—

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

5.ND.20

Dana classification

—

IMA status

Approved mineral and/or valid name (A)

IMA symbol

Sv

Locality

🇻🇪 Cerro Autana

Type locality

—

Discovery year

—

Source: Wikidata