Catalog Search Guide
You can search our catalog using different mineral attributes. For example, you can search by color such as green, yellow or purple, or by chemical elements such as uranium, calcium or iron, or by mineral groups such as phosphate, silicate or carbonate. You can also filter by crystal habit like crystal, geode or crystal on matrix, by specimen size such as thumbnail, small, medium or cabinet, and by features such as radioactive or fluorescent minerals.
Hopper Quartz
Hopper quartz is a rare skeletal growth form of quartz (SiO2) in which the edges and corners of the crystal race ahead of the faces, leaving stepped, hollow, terrace-like depressions instead of flat, solid faces. This happens because during very rapid, high-supersaturation growth, atoms attach far faster at the high-energy edges than at the centers of the faces, producing the staircase or "hopper" morphology also seen in halite and galena. Collectors also know this habit as skeletal, window, or fenster quartz, and pieces range from fully open frames to partially closed, near-solid crystals with only a faint hint of hoppering.
The classic hunting ground for this habit is the Herkimer mining district of New York, where hoppered Herkimer diamonds are prized alongside elestial and negative-scepter forms. In Europe, the Porretta Terme quartz occurrences near Bologna, Italy, have produced legendary double-terminated hopper crystals with vivid yellow clay inclusions, while skeletal quartz is also documented from Banská Štiavnica in Slovakia and from alpine-type veins across the Alps. Fine hoppered quartz has additionally been reported from Pakistan and Afghanistan, often associated with smoky or milky quartz generations.
Because true hopper growth in quartz is genuinely uncommon compared with window/fenster forms, well-defined specimens are highly sought by systematic collectors and growth-form specialists. Each crystal is essentially a frozen record of an unusually fast, unstable growth episode, making hopper quartz a favorite for study pieces, thumbnails, and cabinet specimens alike.
QUARTZ DIAMOND HOPPER – Natural Italian Quartz with Golden Inclusion
