Loellingite

Loellingite is an iron arsenide mineral with the formula FeAs2.

The first noticeable trait of a loellingite chunk is its heft. It feels heavy in the hand, especially compared with quartz or calcite. Most pieces are silver-gray to steel-gray, with a metallic shine like freshly filed metal on a clean face under a show light.

At a quick glance it can be mistaken for any shiny ore. Loellingite is usually opaque and often massive. When broken it tends to fracture in a jagged, hackly way that resembles broken metal rather than broken glass.

The mineral's history centers on Austria. It was described in 1845 by Wilhelm Karl von Haidinger, who named it after Lölling in Carinthia, an area tied to old arsenic and iron mining districts, where rocks can show rusty streaks and a sharp, metallic smell when fresh material is cracked.

And if you’ve flipped through older books or handled old dealer labels, you’ll probably run into the name “leucopyrite.” That older name tripped people up because it got used loosely for a few pale metallic arsenic minerals, so modern labels usually stick with loellingite to keep things clean.

It shows up in hydrothermal veins and ore districts in a bunch of countries, especially across central Europe and parts of Russia, China, and North America.

Most loellingite turns up in hydrothermal veins, the kind you see cutting through rock where iron and arsenic rich fluids push along fractures, then cool off and drop minerals out. It tends to sit right alongside other ore minerals. And it usually shows up in spots that are reducing enough that the arsenic ends up as an arsenide, not an arsenate.

The paragenesis on a good specimen label usually lists the same associates: arsenopyrite, pyrite, native arsenic, and sometimes cobalt and nickel arsenides. The vein gangue is typically quartz or carbonates, which fill the rest of the fracture around the metallic minerals, often as dull, sugary quartz.

But if you’ve ever had loellingite and arsenopyrite sitting side by side in a flat dealer tray under those harsh overhead lights, you already know the headache. Depending on the angle, they can look weirdly alike until you stop guessing and start checking hardness and crystal habit. Seriously, who hasn’t been fooled for a second?

Color: Silver-gray to steel-gray, sometimes with a faint tin-white look on fresh surfaces. Tarnish can dull it toward darker gray.

Luster: Metallic luster, especially bright on fresh break surfaces.

Comparing two similar-sized pieces by weight is a useful test. Loellingite usually feels heavier than expected and has a cold, metal-like feel that warms slowly in the hand. A steel blade scratches it only with difficulty, unlike soft galena, yet a file will mark it, unlike corundum. Photos hide texture, so tilt a specimen under a single point light and look for sharp, mirror-like flashes from clean faces.

Loellingite is sometimes confused with these materials:

• Arsenopyrite (FeAsS)
• Pyrite (especially fine-grained "pyrite ore")
• Marcasite (often sold as pyrite)
• Native arsenic (massive, tin-white to steel-gray)
• Skutterudite (cobalt arsenide, similar metallic gray)
• Hematite (specular, steel-gray metallic luster)

Brief handling is acceptable, but loellingite should be treated like any arsenic mineral. Keep dust to a minimum and do not put it in elixirs or water bowls. Wash hands right after holding it, since it can leave a gritty film on the fingertips, and do not eat while sorting ore minerals.

Do not cut, grind or sand this mineral without proper ventilation and a respirator rated for fine particulates, because dust spreads widely. If a specimen sheds crumbs, keep it bagged or in a closed box, such as a lidded plastic tote, and out of reach of children and pets.

Rough/Tumbled: $15 - $250 per specimen

Prices swing all over the place depending on crystallization and how it’s labeled. A big, dull, massive chunk usually goes for cheap. But put a few sharp, glassy crystals on a contrasting matrix, the kind that catches the light when you tilt it under the show lamps, and the price climbs fast, because you just don’t see that many truly eye-catching pieces sitting on dealers’ tables.

Moderate — Scratch resistance: Good, Toughness: Fair

It’s generally stable on a shelf, but fresh metallic faces can dull over time if you handle it a lot or store it in humid conditions.

Use & Storage

Store it in a specimen box or closed display case, especially if the material is crumbly. Small compartment boxes work well, because loellingite can scuff softer minerals if they share a drawer.

Cleaning

1) Wear gloves and work over a tray. 2) Use a soft dry brush or compressed air to remove dust. 3) If needed, wipe lightly with a barely damp cloth, then dry immediately; do not soak.

Cleanse & Charge

For energetic cleansing, smoke, sound, or placing the stone near other stones are the usual choices. Water and salt should be avoided. A quick smoke cleanse is the simplest option.

Placement

A shelf spot with low humidity and no direct sun is easiest. And keep it away from places where it’ll get handled constantly, like a coffee table bowl.

Caution

Loellingite contains arsenic, so it should not be soaked in water. Avoid breathing any dust it sheds, including the fine, gritty residue that clings to fingers, and wash hands after handling. Do not use it for crystal water or in any display where it might touch food.

Loellingite has little tradition of its own, and its modern associations come from crystal practice. Practitioners link it with the Root and Third Eye chakras, the signs Capricorn and Scorpio, and the elements Earth and Fire. Its weight and plain, unpolished look lead some people to describe it as sober and grounding, and to use it as a desk stone for concentration or for clear decision-making. These are beliefs and personal practice, not proven effects, and they do not replace medical or mental health care.

In practice, loellingite is mainly a collector and study mineral. Because it contains arsenic, it is best kept in a closed specimen box or display case, away from food, children and pets. Wash hands after handling, avoid creating dust by cutting or grinding, and do not place it in water, elixirs or crystal water. Smoke or sound are the usual cleansing methods in crystal practice. Its hardness can scuff softer minerals stored in the same drawer, so separate boxes are sensible.