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GEM KNOWLEDGE · LABORATORY NOTES

Gedrite

Polished Gedrite palms with black, gray and silvery fibrous patterns, displayed across a hand.© Soul Body Gems
Gedrite polished palms from the Soul Body Gems collection.

Two Swedish specimens contain quartz and a member of the gedrite–ferrogedrite amphibole series. The left resembles garbenschiefer with radiating amphibole sprays; the right has amphibole dispersed through quartz. X-ray diffraction supports gedrite.

Report: Sample 1219, completed March 1, 2025. Findings apply to the specimen examined.

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 left specimen in Fig. 1.

  • 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. (quartz)

  • 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 (gedrite/ferrogedrite).

  • 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.5: Backscattered electron image of an area of the right specimen in Fig. 1.

  • 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. 6: Energy dispersive spectrum of spot 1 in Fig. 6 (gedrite/ferrogedrite).

  • 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. 7: Energy dispersive spectrum of spot 2 in Fig. 6 (quartz).

  • 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. 8: X-ray diffraction scan of the material, with matches for quartz and gedrite.

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: 1219 (#1 gedrite from Sweden )

Submitted by: Soul Body Gems

Date completed: 3-1-2025

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 Phase X-ray diffractometer was also used in the study and operated at 30 kV and 10 mA.

Fig. 1: Photograph of the specimens. 7 cm maximum dimension.

Fig.2: Backscattered electron image of an area of the left specimen in Fig. 1.

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

Fig. 4: Energy dispersive spectrum of spot 2 in Fig. 2 (gedrite/ferrogedrite).

Fig.5: Backscattered electron image of an area of the right specimen in Fig. 1.

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Fig. 6: Energy dispersive spectrum of spot 1 in Fig. 6 (gedrite/ferrogedrite).

Fig. 7: Energy dispersive spectrum of spot 2 in Fig. 6 (quartz).

Fig. 8: X-ray diffraction scan of the material, with matches for quartz and gedrite.

Summary of findings: These specimens (Fig. 1) are very nice. The left one is a typical ‘garbenschiefer’, a schist with sprays oof diverging amphiboles, the right one looks more like the amphibole is dispersed through the quartz.

Both species contain quartz (Figs. 2, 4, 5 and 7) and an amphibole which is a member of the gedrite/ferrogedrite series (Figs. 2, 3,5 and 6). Gedrite is also confirmed by X-ray diffraction (Fig. 8).

Date: 3-1-2025 Signature

Gedrite Surfboard Palms
Gedrite Surfboard Palms, December 2025.

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.