GEM KNOWLEDGE · LABORATORY NOTES
Fluorite in Calcite
This striking specimen contains fluorite and calcite, with other minerals visible in the analytical study. Soul Body Gems observes a UV response in the calcite portion.
Finding: Sample 1501, completed December 5, 2025, was described as fluorite, calcite, quartz, calcic plagioclase and a calcium-rich pyribole. The report also labels an apatite analysis and illustrates graphic fluorite–quartz textures with elemental maps.
UV note: Soul Body Gems reports that the calcite is UV reactive. The supplied analytical report identifies minerals but does not itself document a fluorescence test; UV behavior can vary by specimen and lighting conditions.
View the original report
Select a page to enlarge it. 6 pages; findings are summarized in accessible text above.
Report images © Soul Body Gems, Alexander Falster and the Maine Mineral & Gem Museum. Please acknowledge all three when referring to these results. Findings apply to the specimen examined.
Another tested specimen: a ring
Sample: 10670 (#6 ring). Completed: August 30, 2024.
Finding: The ring’s stone contains both calcite and fluorite. Both minerals have very low concentrations of substituting elements.
This ring was submitted as another example of the same material, according to Soul Body Gems records. Its approximately 2 cm stone was examined using electron microscopy, energy-dispersive spectra and an elemental map showing the calcite and fluorite areas.
View the original test results
Select a page to enlarge it.
These results are the property of Soul Body Gems, Alexander Falster, and the Maine Mineral & Gem Museum. Any mention requires full acknowledgment.
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.
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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.
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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 (calcite).
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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 (fluorite).
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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. 5: X-ray map of the area shown in Fig. 2: left: carbon: red,fluorine: green.
Read the ring report as text
Analytical Result Report Sample id: 10670 (#6 ring) Submitted by: Soul Body Gems Date completed: 8-30-2024 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. Fig. 1: Photograph of the specimen. The stone is about 2 cm in maximum dimension. Fig.2: Backscattered electron image of an area of the specimen. Fig. 3: Energy dispersive spectrum of spot 1 in Fig. 2 (calcite). Fig. 4: Energy dispersive spectrum of spot 2 in Fig. 2 (fluorite). Fig. 5: X-ray map of the area shown in Fig. 2: left: carbon: red,fluorine: green. Table 1: Minor and trace elements in the calcite and fluorite, in wt. %. Summary of findings: This specimen (Fig. 1) has a stone composed of both calcite (Figs. 2, 3 and 5) and fluorite (Figs. 2, 4 and 5). Both calcite and fluoritie are very low in substituting elements (Table 1) Date: August 30, 2024 Signature
| Element | Calcite | Fluorite |
|---|---|---|
| Iron | 0.07 | 0.03 |
| Magnesium | 0.45 | 0.25 |
| Manganese | 0.02 | 0.02 |
| Zinc | 0.03 | 0.03 |