Identification guide · Minerals
How to Identify Galena
Galena is easily identified by its bright, silvery, metallic luster, cubic crystal habit, and perfect cleavage in three directions at right angles, producing smaller cubes when broken. Its streak is gray to black, hardness is low at 2.5, and its density is unusually high, noticeably heavier in the hand than most other minerals of similar size. It is rarely confused with anything else once its weight and cubic cleavage are noted, though tarnished surfaces can occasionally be mistaken for other dark sulfides until a fresh cleavage face is exposed.
Galena identification checklist
| Color | Lead-gray, Silvery gray | Look at a clean, dry surface in daylight. Color zoning, banding or spots are as diagnostic as the hue. |
|---|---|---|
| Luster | Metallic, bright | Turn it under a lamp: a true metallic shine reflects like polished metal and stays opaque at thin edges. |
| Transparency | Opaque | Hold a thin edge up to a bright light and note whether light passes through. |
| Mohs hardness | 2.5 | A copper coin (Mohs 3.5) scratches it, but a fingernail does not. |
| Streak | Lead-gray | Drag a corner across unglazed porcelain (the back of a bathroom tile) and check the powder color. |
| Cleavage | Perfect cubic {001}, three directions at 90° | |
| Fracture | Subconchoidal (rarely seen; mostly cleaves) | Broken surfaces show smooth, curved, shell-like scoops. |
| Specific gravity | 7.4–7.6 | Very heavy, metallic heft (specific gravity about 7.5). |
| Crystal system | Cubic |
Galena look-alikes and how to tell them apart
Both sit near Mohs 2.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Galena vs Bismuth →
Both sit near Mohs 2.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Galena vs Chalcocite →
Galena is harder (Mohs 2.5) than Graphite (Mohs 1–2), so Galena will scratch Graphite and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Galena vs Graphite →
Both sit near Mohs 2.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
Galena identification FAQ
How can you tell if a rock is Galena?
Check the color (lead-gray and silvery gray), the metallic, bright luster, a Mohs hardness of 2.5 and a lead-gray streak. Photographing it with the StoneSnap app gives a match in seconds.
What is the hardness of Galena?
Galena has a Mohs hardness of 2.5. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
What is the difference between Galena and Bismuth?
Galena (Mohs 2.5, metallic, bright luster) and Bismuth (Mohs 2–2.5, metallic luster) look alike, but hardness, streak and heft usually separate them. See the full Galena vs Bismuth comparison for a side-by-side table.
Is Galena worth anything?
Entry-level Galena specimens sell for around $2, typical collector pieces about $20, and premium examples $150 or more depending on size, quality and locality.
What color is Galena?
Galena is most often lead-gray and silvery gray. Color varies with impurities and locality, so confirm with hardness and luster rather than color alone.
