Pyrite, Talc & Serpentine (Self-find, Analyzed) | Acrylic Mineral Display

Mounted on top of an acrylic display is a specimen of Pyrite, Talc & Serpentine (likely a Listwanite rock). This was a self-find of mine back in May, 2025 from Hamilton, Washington, USA. [Hamilton is near Marblemount, North Cascades]

I had an XRF completed and the green mineral is primarily Magnesium-dominant. The two principal minerals appear to be talc and a Serpentine group mineral, most likely Antigorite with a likely admixture of platy Brucite. The metallic mineral that is spattering the matrix was found to be Pyrite. It can be hard to spot with the naked eye but with a magnification you will see, flashy, gold-colored flecks all over the matrix.

The specimen is secured with a high quality silicon gel. All the necessary information is included, engraved on two sides of the display:

PYRITE, TALC & SERPENTINE

Chemical formulas: FeS2, Mg3Si4O10(OH)2, Mg3Si2O5(OH)4

Locality: Hamilton, Skagit County, Washington, USA Found by M. Trygve: 06.May.2025

Analysis by Excalibur Specimen dimensions: 4 x 3 x 3.5 cm

Acrylic Display dimensions: 3.8 x 3.8 x 2.5 cm

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