GEM KNOWLEDGE · LABORATORY NOTES
Green Tanzberry Quartz
The tested mineral assemblage behind a green Tanzberry trade name.
What the report found: Quartz with chromium-bearing muscovite (fuchsite) inclusions, plus minor other grains.
These green tumbled stones were sourced from the Tanzanian mine that also supplied the red Tanzberry material. The laboratory identified quartz with inclusions of chromium-bearing muscovite (fuchsite). It also observed some plagioclase and a few black spinel-group grains, probably chromite. The report measured 1,440 ppm chromium, 575 ppm iron, and 420 ppm titanium in the teal material.
The green and red Tanzberry (Red) are different tested assemblages: the red material contains red muscovite and magnetite in quartz. “Green Strawberry Quartz” is a market name sometimes used for the green material, but it obscures the actual fuchsite-bearing composition and should not be confused with the red strawberry quartz material.
Find this same report under: Tanzberry (Green) · Green Tanzberry Quartz · Green Strawberry Quartz
View the original report
Select a page to enlarge it. A text transcript appears below.
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. 1: Backscattered electron image (green stone)
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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. 2: Energy dispersive spectrum of spot 1 in Fig. 1. Quartz.
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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 2 in Fig. 1. Chromian muscovite (fuchsite)
Read the report as text
Analytical Result Report Sample id: 9034 (green tumbled stones) Submitted by: K.Bitner Date submitted: May 29, 2020 Date completed: June 1, 2020 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: Backscattered electron image (green stone) Fig. 2: Energy dispersive spectrum of spot 1 in Fig. 1. Quartz. Fig. 3: Energy dispersive spectrum of spot 2 in Fig. 1. Chromian muscovite (fuchsite) Fig. 4: Photomicrograph of inclusion of chromian muscovite . 3 mm across the field of view. Summary of findings: Those are very pretty tumbled stones! Quartz with inclusions of chromian muscovite (‘fuchsite’). The chromophoric elements of teal material shows 1440 ppm chromium, 575 ppm iron and 420 ppm titanium. These are the chromophoric elements. I have also seen some plagioclase inclusions and a few black grains of a spinel group mineral, likely chromite. Date: June 1 ,2020 Signature