Fine red inclusions give this historic material from Chihuahua its color. Specimen records tell us where it's been found, why intact crystals are scarce, and how much of its early history is still a mystery.
Loving Thyself Rocks ·
Close-up of fine red hematite inclusions inside a strawberry quartz crystal from Chihuahua, Mexico
Turn a piece of classic strawberry quartz under a light and watch where the red appears. From one angle, the quartz can look almost clear. Tilt it, and fine red inclusions catch the light inside the crystal. On some pieces, those inclusions follow the geometry of the quartz itself. That’s what drew us to our parcel of Mexican strawberry quartz, and it sent us looking for the mineralogical research and collector records behind the material.
Where the red comes from
An inclusion is material enclosed inside a crystal. In classic strawberry quartz, fine red inclusions give otherwise colorless quartz its pink to red appearance. A study by John S. White, published in Gemmologie in 2000 and summarized in The Journal of Gemmology, describes wispy red hematite in the samples examined. The summary also notes that the hematite can concentrate in thin layers near the crystal’s surface, particularly near the edges of its triangular termination faces. It identifies Chihuahua, Mexico, as a source of some of the finest examples. The Journal of Gemmology, p. 368
One of the best illustrations of what those patterns can look like comes from mineral collector Rock Currier. His Mindat record documents a cabochon cut by Glen Vargas from quartz attributed to Urúachic, Chihuahua. Currier describes inclusions oriented differently in different sectors of the crystal. Cut across the tip and polished into a rounded cabochon, the pattern can look like a pie divided into six wedges. The cut makes an internal feature of the crystal easier to see. Rock Currier’s specimen record, Mindat
Where in Mexico did it come from?
Urúachic, Chihuahua, is one of the best-documented localities. In a 2023 Rocks & Minerals article, Carl A. Francis and David E. Ziga identify it as a principal occurrence of strawberry quartz. Their figure 15 shows a 5.5 cm specimen with colorless calcite from the collection of Joseph and Susan Kielbaso, photographed by Jeff Scovil. It’s an excellent reference if you’ve only seen the material as a polished stone and want to see it in crystal form. Francis and Ziga, Rocks & Minerals, 2023, fig. 15
Other records carry different locality labels. Heritage Auctions cataloged a well-terminated specimen under Cuauhtémoc, Chihuahua, attributing it to a historic Mexican find of the 1950s or 1960s. Those records give us a solid regional picture, while the precise source of an individual piece still depends on the provenance that came with it. Heritage Auctions specimen catalog
Why intact crystals are so scarce
Currier’s account offers a clue. He notes that relatively few crystals had good inclusions to begin with and that few survived uncut through the lapidary activity of the 1950s and 1960s. The very feature that made the rough worth keeping also made it worth cutting. A lapidary could take a crystal with a promising pattern and polish it into a gem that showed the inclusions more clearly. That left fewer examples with their original crystal form intact. Rock Currier’s specimen notes, Mindat
The exact quantity recovered is harder to pin down. In our research, we found historical accounts that associate the classic material with the mid-20th century, but no production records confirming a total of 50–80 kilograms or establishing the full period of recovery. The clearest evidence of rarity is the collector record describing how few well-included, uncut crystals survived. Mindat specimen record · Heritage Auctions specimen catalog
What the name can tell you
“Strawberry quartz” is a trade name, and pieces sold under it can have different inclusions. In a 2021 Gems & Gemology report, Shu-Hong Lin, Yu-Ho Li, and Huei-Fen Chen examined a bangle submitted as strawberry quartz and identified it as pink aventurine quartz colored by reddish muscovite. Their microscope images show the visual differences between those mica inclusions and the hematite inclusions associated with strawberry quartz. It’s a good example of why a trade name, a mineral identification, and a locality label each tell you something different about a stone. GIA, Pink Aventurine Quartz with Alurgite Inclusions
When you look through our parcel, take a moment to follow the red into the quartz. Look for where the inclusions gather, where they thin out, and how they change as the light moves. A photograph can capture the color in one position. Turning the stone lets you see how the pattern sits inside it. That’s the detail we keep coming back to, and the one that makes this material so rewarding to look at closely.
