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GEM KNOWLEDGE · LABORATORY NOTES

Copper Silicates

Blue and green copper silicates in a polished heart supplied as Congo material.

Sample: 1073 (#4, shattuckite heart) · Report completed: September 25, 2024.

Identification: Copper silicates with iron oxides. Specific copper-silicate species were not conclusively resolved.

What the testing revealed

The blue and green portions are copper silicates. Iron oxides, such as goethite or hematite, were also encountered.

X-ray diffraction was inconclusive because the material is poorly crystalline, producing a broad amorphous hump and faint peaks. The report therefore does not confirm shattuckite as the identity of this particular heart.

Soul Body Gems notes that this variation is often mined alongside shattuckite in Congo. That sourcing context explains its inclusion under Shattuckite (Congo); it is separate from laboratory confirmation of its mineral species.

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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. This is the blue part. (a copper silicate)

  • 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. 4: Energy dispersive spectrum of spot 2 in Fig. 2 (iron oxide, such as goethite or hematite)

  • 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. 2. This is the green part. (a copper silicate)

  • Element map: This map shows where the named elements occur within the analyzed area. Its colors represent the laboratory’s selected element channels, rather than the specimen’s visible colors. The caption below preserves any color key or distribution noted by the laboratory.

    Laboratory figure caption: Fig. 6: X-ray map of the area shown in Fig. 2. Copper: blue, silicon: yellow.

  • Diffraction scan: This scan helps identify crystalline minerals by comparing the measured pattern with reference patterns. The laboratory interpretation explains which minerals the comparison supports.

    Laboratory figure caption: Fig. 7: X-ray diffraction scaan of the blue parts in the specimen. Note very poor crystallinity as is evidnet from the amorphous hump.

Read the complete report as text

Analytical Result Report

Sample id: 1073 (#4, shattuckite heart)

Submitted by: Soul Body Gems

Date completed: 9-25-2024

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 in the study and operated at 30 kV and 10 mA.

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. This is the blue part. (a copper silicate)

Fig. 4: Energy dispersive spectrum of spot 2 in Fig. 2 (iron oxide, such as goethite or hematite)

Fig. 5: Energy dispersive spectrum of spot 3 in Fig. 2. This is the green part. (a copper silicate)

Fig. 6: X-ray map of the area shown in Fig. 2. Copper: blue, silicon: yellow.

Fig. 7: X-ray diffraction scaan of the blue parts in the specimen. Note very poor crystallinity as is evidnet from the amorphous hump.

Summary of findings: This specimen (Fig. 1) is interesting. The blue and green portions are copper silicates (Figs. 2, 3, 5, and 6). Iron ooxides such as goethite or hematite were also encountered (Figs. 2 and 4). X-ray diffraction yielded inconclusive results due to the poor crystallinity of the material. This is evident by the amorphous hump and faint peaks.

Date: 9-25-2024 Signature

See the other Shattuckite (Congo) reports →

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: 1073 (#4, shattuckite heart)

Submitted by: Soul Body Gems

Date completed: 9-25-2024

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 in the study and operated at 30 kV and 10 mA.

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. This is the blue part. (a copper silicate)

Fig. 4: Energy dispersive spectrum of spot 2 in Fig. 2 (iron oxide, such as goethite or hematite)

Fig. 5: Energy dispersive spectrum of spot 3 in Fig. 2. This is the green part. (a copper silicate)

Fig. 6: X-ray map of the area shown in Fig. 2. Copper: blue, silicon: yellow.

Fig. 7: X-ray diffraction scaan of the blue parts in the specimen. Note very poor crystallinity as is evidnet from the amorphous hump.

Summary of findings: This specimen (Fig. 1) is interesting. The blue and green portions are copper silicates (Figs. 2, 3, 5, and 6). Iron ooxides such as goethite or hematite were also encountered (Figs. 2 and 4). X-ray diffraction yielded inconclusive results due to the poor crystallinity of the material. This is evident by the amorphous hump and faint peaks.

Date: 9-25-2024 Signature

Report acknowledgment: These analytical results and report materials are the property of Soul Body Gems, Alexander Falster, and the Maine Mineral & Gem Museum. Any use or mention of these results requires full acknowledgment of all three.

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Results shown here apply to the specimens identified in the reports. A trade name or visual resemblance alone does not establish the composition of another piece.