Galena Showcase

Galena (Galena) is one of the most important and well-known sulfide minerals. If hematite is the “King of Iron” and malachite the “Ambassador of Copper,” galena is unquestionably the “King of Lead.”

1. Mineralogical Specifications

Chemical Formula: $\text{PbS}$ (Lead sulfide).

Color: Lead-gray (highly lustrous and metallic).

Crystal System: Cubic.

Hardness: 2.5 (very soft; easily scratched with a knife).

Density: Extremely high (7.4 to 7.6 g/cm³). This characteristic is fascinating for visitors; a small piece of galena held in the hand feels unexpectedly heavy.

2. Visual Characteristics

Cubic Cleavage: Due to its cubic structure, galena invariably fractures into perfect cubes or aggregated clusters of cubes (perfect cleavage). Within the showcase, this “natural geometry” of galena is a masterpiece—appearing hand-carved, yet entirely natural.

Metallic Luster: Freshly fractured surfaces of galena exhibit a dazzling metallic luster, though over time exposure to air may cause slight tarnishing.

Galena: The Heavyweight Cube

“Galena, a geologist-favorite mineral renowned for its geometric symmetry, serves as the world’s primary ore for lead extraction. In nature, it frequently grows as pristine, perfect cubes, appearing as though crafted by a meticulous artisan. Yet, do not be deceived by this cold, orderly exterior—galena is significantly heavier than it appears! This mineral has played a pivotal role not only in our vehicle batteries but also in the historical extraction of silver.”

“Did you know? In ancient times, galena was used to make eye cosmetics and eyeliners (due to its ease of pulverization and gray-black color). Today, however, we recognize that lead is a toxic substance and must be handled with care.”