Gold identifier by photo

The gold identifier compares a gold-colored find with the minerals that most often fool people: pyrite, chalcopyrite and weathered mica. Upload one to three photos of the same find: the whole find beside a coin, the opposite side in daylight, and a sharp close-up of the gold-colored part. Then choose where it came from: creek or placer gravel, a quartz vein or mine dump, bought or inherited, or not sure.

The result lists possible matches, the visible clues behind each one, the lookalikes, and what the photos could not settle. It ends with a follow-up question you can answer or ask about, most often whether the find feels heavy for its size or exactly where it was found.

Gold-colored grains have several possible explanations, including pyrite, chalcopyrite, mica, coatings and native gold. The tool compares visible form, luster and surrounding material together. It does not require a smooth nugget shape: natural gold can also form rare crystals. A yellow color, a rounded grain or the absence of obvious tarnish never proves gold.

Start by describing the reflected light and the form of each visible grain. Thin flat flakes that flash at a similar angle may support a mica comparison. The USGS names pyrite, chalcopyrite and weathered mica among familiar gold lookalikes. Avoid deciding from glitter alone, because a photograph may not resolve the individual grains.

A metallic luster on a solid lump, grain or crystal means a metal or a metallic mineral, and shape comes next. The gold identifier treats glitter in sand differently from one solid grain, so a close-up of a single grain beside a coin beats a wide view of a sparkling pan.

Pyrite grows as sharp cubes, often with fine parallel lines on the faces, as pyritohedra with twelve five-sided faces, or as angular granular masses. Chalcopyrite is usually massive and brittle, with blue, purple and red tarnish. Marcasite is a paler brass with a greenish tint, in radiating, cockscomb or spear shapes, and bronze-colored pyrrhotite is often magnetic.

Gold commonly occurs as small flakes, sheets, irregular grains and nuggets. Crystalline gold also exists, including rare cubic and octahedral forms described by the Utah Geological Survey. Clear striated cubes can favor pyrite, but crystal faces alone do not exclude gold. Keep an unresolved mineral comparison when the shape is too small, distorted or coated to interpret.

Gold, pyrite and chalcopyrite can overlap in apparent yellow color. Camera white balance, reflected surroundings, exposure and coatings can shift that appearance. Compare a neutral-light overview with another angle, noting whether the surface is pale brass, yellow, iridescent or patchy. Tarnish may support some alternatives, but a clean yellow surface does not certify gold.

Use diffuse daylight and open shade, keep a neutral ruler in the frame and avoid filters. Record whether a bright patch moves with the reflection rather than calling every change a material property. The same grain can look different between photographs. If the useful detail is lost in glare, a better exposed view helps more than a confident color label.

Gold can occur in rock-hosted deposits and in sediment concentrated by erosion. Quartz veins and creek gravels provide context, but neither establishes that a visible grain is gold. The USGS describes lode and placer deposits; that geological setting must remain separate from an identification of the particular speck in your photograph.

Pyrite turns up almost everywhere: in slate, coal, shale, quartz veins and concretions, so a quartz vein alone does not settle it. A real nugget feels heavy for its size, but a photo cannot weigh anything. Mention the heft and the setting when the gold identifier asks its follow-up.

For the white vein rock itself, use the quartz identifier. For a crystal you cannot place, compare it with the mineral identifier.

More than one row can apply to a single rock, since pyrite and gold can share a quartz vein.

Gold-colored manufactured material also belongs in the comparison. A visible coating boundary, mold seam, regular glitter or worn area may suggest paint, a cast object, plated material or glass. None establishes the exact alloy or coating. Flakes in a souvenir vial remain unverified material. For jewelry, record the item as manufactured and explain that photos cannot assay the metal or authenticate a stamp.

The gold identifier cannot measure gold content, karat, weight or recoverable value. Qualified laboratories and assay services can choose suitable analytical methods when composition matters. Do not scratch, crush, heat or apply acids to an unknown find for this tool. A prospecting group may help document visible clues, but a visual opinion is separate from an analytical result.

Use an overview to show where the yellow material sits, followed by a detail with a millimeter ruler in the same plane. If the rock contains several colors or grains, identify the patch you want compared. A brassy crystal beside a pale vein is a different observation from loose glitter in sediment. Keep both the grain and its surrounding material available for review.

Write down what was directly observed and what came from a seller, old label or collection story. If you already measured mass or noticed magnetic attraction, give the method and the part examined; the tool treats those notes as unverified context. Do not invent a density from apparent size. A follow-up can focus on the next useful photograph while leaving metal content unresolved.