Chrome Chalcedony (Congo) — Market Label Meaning, Metaphysical Energy & Geology

The tested green material is malachite overgrown by drusy, visibly crystalline quartz on a gossan base. The report found no chromium and no chalcedony. It was sourced as a small 2023 pocket from Congo, but that locality and find history were not established by the analytical test.

Report: Sample 1105, completed November 6, 2024. Findings apply to the specimen examined.

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Report images © Soul Body Gems, Alexander Falster and the Maine Mineral & Gem Museum. Please acknowledge all three when referring to these results.

Understanding the report figures

Use this guide alongside the written findings and the original report transcript. It explains the purpose of each analytical figure and preserves the laboratory’s own figure labels. The interpretations apply to the tested specimen; signals alone do not establish the identity of every similar-looking stone.

Electron microscope image: This view shows small-scale regions selected for analysis. Its brightness contrast helps distinguish regions with different compositions; it is not a photograph of their natural colors. Numbered spots connect this view to the analyses listed in the report.
Laboratory figure caption: Fig.2: Backscattered electron image of an area of the specimen.
Elemental spectrum: The peaks record characteristic X-ray signals from elements in the analyzed spot or area. This is an analysis of that location, not automatically of the entire specimen. Any mineral identification or uncertainty named in the laboratory caption is retained below.
Laboratory figure caption: Fig. 3: Energy dispersive spectrum of spot 1 in Fig. 2. (malachite)
Electron microscope image: This view shows small-scale regions selected for analysis. Its brightness contrast helps distinguish regions with different compositions; it is not a photograph of their natural colors. Numbered spots connect this view to the analyses listed in the report.
Laboratory figure caption: Fig.4: Backscattered electron image of another area of the specimen.
Elemental spectrum: The peaks record characteristic X-ray signals from elements in the analyzed spot or area. This is an analysis of that location, not automatically of the entire specimen. Any mineral identification or uncertainty named in the laboratory caption is retained below.
Laboratory figure caption: Fig. 5: Energy dispersive spectrum of spot 3 in Fig. 4. (quartz)

Read the original laboratory report as text

The following text and tables are transcribed from the original laboratory document. Figure captions identify the report images; the laboratory interpretations and limitations are preserved.

Laboratory report 1

Analytical Result Report

Sample id: 1105 (so-called chromian chalcedony)

Submitted by: Soul Body Gems

Date completed: 11-6-2024

Operating conditions: An AMRAY 1830 SEM operated at 25 kV acceleration potential, 24 mm working distance, 0 degrees sample tilt, coated with 250 Å carbon, and also using the attached XRF unit operated at 30 kV.

A Bruker D2 Phaser X-ray diffractometer was also used and operated under 30kV and 10 m

Fig. 1: Photograph of the specimen. Approximately 55 mm maximum dimension.

Fig.2: Backscattered electron image of an area of the specimen.

Fig. 3: Energy dispersive spectrum of spot 1 in Fig. 2. (malachite)

Fig.4: Backscattered electron image of another area of the specimen.

Fig. 5: Energy dispersive spectrum of spot 3 in Fig. 4. (quartz)

Summary of findings: These specimens (Fig. 1) are very pretty. The green material, where exposed, shows that it is the copper mineral malachite (Figs. 2 and 3). It is overgrown with drusy quartz crystals (Figs. 4 and 5). There is no chromium present, the specimens are quartz which grew over malachite which sits on a base of gossan (goethite/limonite, an iron oxy hydroxide which is typical for the oxidized portions of sulfide deposits. If copper is present in the primary ore, it will form malachite and other copper species near the surface.

There is also no chalcedony present, the quartz is present as macroscopically visible crystals.

Date: 11-6-2024 Signature