Mounted to an acrylic display is a fine specimen of TALC, ANTIGORITE & BRUCITE.
This was a self-find of mine back in October, 2024 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 specimen is secured with a high quality silicon gel. All the necessary information is included, engraved on two sides of the display:
TALC, ANTIGORITE & BRUCITE
Chemical formulas: Mg3Si4O10(OH)2, Mg3Si2O5(OH)4, Mg(OH)2
Locality: Hamilton, Skagit County, Washington, USA
Found by M. Trygve: 29.October.2024
Analysis by Excalibur
Specimen dimensions: 4.5cm x 2.5cm x 2cm
Acrylic Display dimensions: 3.8 x 3.8 x 2.5 cm
I'm excited to finally have a specimen that was personally collected to offer. I noticed a hand sized boulder that had a fractured face with the most stunning green color. After cracking it open, the minty/sea foam green persisted throughout with inky black and iron oxide appearing inclusions. The outside of the stone was covered in an orange iron oxide like crust which is still visible at the base of the specimen.
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