GEM KNOWLEDGE · LABORATORY NOTES
Cosmic Cheetah Jasper from Brazil
A heart-shaped Brazilian material marketed as Cosmic Cheetah Jasper, part of a find introduced to us in 2020.
Tested specimen: 8112 (Brazil heart) · Report completed: April 14, 2020
Key finding: The bulk of the tested specimen was quartz in a granular matrix with small cavities lined by microscopic quartz crystals. Barite was a minor, widespread accessory. The dark domains were attributed to black hydrocarbon compounds.
What the report means
“Cosmic Cheetah Jasper” is the market name used for this material. The report identifies its components in this specific heart rather than certifying every piece sold under that name.
View the original test results
Select any report page to enlarge it. The pages are reproduced from the analytical report for this individual specimen.
Mineral identification is specific to the sample analyzed. The full report pages preserve the laboratory's wording and limitations.
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 photomicrograph of area 1 in sample 8112.
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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. (Barite with some quartz interference)
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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. (quartz)
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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 4: Backscattered electron photomicrograph of area 1 in sample 8112. Showing quarzt crystals and barite grains in the small cavity. The area of spot 1 which darker is coated with hydrocarbon!
Read the report as text
This transcription makes the laboratory findings, figure captions, and table values available without opening the page images. Refer to the original images above for visual details.
Laboratory report
Analytical Result Report Sample id: 8112 Brazil heart Submitted by: Kathreen Bitner Date submitted: April 10, 2020 Date completed: April 14, 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 attacement with 35kv potental in conjunction with the EDS system Fig 1: Backscattered electron photomicrograph of area 1 in sample 8112. Fig. 2: Energy dispersive spectrum of spot 1 in Fig. 1. (Barite with some quartz interference) Fig. 3: Energy dispersive spectrum of spot 2 in Fig. 1. (quartz) Fig 4: Backscattered electron photomicrograph of area 1 in sample 8112. Showing quarzt crystals and barite grains in the small cavity. The area of spot 1 which darker is coated with hydrocarbon! Summary of findings: This is an interesting sample, the bulk composition is quartz, granular matrix with small cavities that are lined with microscopic quartz crystals. Barite is a minor but wide-spread accessory. The dark colored domains of the specimen are due to black hydrocarbon compounds which is common in void spaces. Essentially a material like asphalt or ‘anthraxolite’ which is seen in other locations as well, for example the Herkimer quartz locations in New York Date: 4-14-2020 Signature