GEM KNOWLEDGE · LABORATORY NOTES
Chrysocolla in Quartz
Chrysocolla in a quartz-rich Peruvian breccia.
What the report found: Quartz-rich breccia, blue and green chrysocolla, and minor malachite.
This approximately 47 mm sphere was reported from Peru. The laboratory describes a quartz-rich breccia with copper mineralization: blue and green chrysocolla occurs in small cavities, with minor malachite. The report suggests malachite formed earlier than the chrysocolla; possible partial replacement is presented as an interpretation, not a confirmed sequence for every area.
“Quantum Quattro” is a market label applied to mixed copper-bearing stones, but it is not an identification established by this test. This specimen has its own composition and is distinct from the other Peruvian chrysocolla entries in our directory. Its tested components should be described directly rather than treated as a single named mineral.
Find this same specimen under: Chrysocolla in Quartz · Quantum Quattro (Peru)
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Analytical Result Report Sample id: 9251 (Peruvian chrysocolla sphere) Submitted by: K. Bitner Date submitted: Jan. 15, 2021. Date completed: Jan. 26, 2021. Operating conditions: JEOL JSM-6400 operated at 25 kV acceleration potential, 15 mm working distance, 15 degrees sample tilt, coated with 250 Å carbon. Using the X-ray fluorescence attachment with 35kv potental in conjunction with the EDS system. Fig. 1: Photograph of the specimen, approximately 47 mm diameter Fig. 2: Close-ups of the specimen. Left: area with several small cavities. Field of view: 5 mm. Middle: view of a chrysocolla-lined small cavity. Field of view 1.5 mm. Right: chrysocolla with a little malachite. Field of view: 1.5 mm. Table 1: Compositions of the specimen (In weight percent) element Silicon dioxide 37.52 Aluminum oxide 1.94 Calcium oxide 0.25 Magnesium oxide 0.88 Iron oxide 0.71 Copper oxide 35.7 Zink oxide 1.21 Manganese oxide 0.77 Summary of findings: The specimen is a sphere made from a quartz-rich breccia with copper mineralization (Fig. 1). Some open voids remain (Fig. 2 left) and are filled with rounded masses of blue chrysocolla (Fig. 2 middle). Minor malachite has been noted coated with blue chrysocolla (Fig. 2 right). Chemically. Copper and silicon oxide are dominant, but a number of elements are evidently substituting for copper or are inclusions of oxides or other species: zinc, magnesium, calcium, iron, manganese and aluminum. Some of the chrysocolla is blue, some is green, this is not unusual for chrysocolla. The earlier copper mineral manifestation here was malachite which was followed by chrysocolla. It is possible also that the green chrysocolla has partially replaced malachite and some is still present. Date: January 26, 2021 Signature


