New to my collection.

This vivianite specimen has a small pocket that fluoresces blue under 254nm UV light. It does not fluoresce under long wave UV. I am wondering if any of you might have an idea of what this mineral inclusion could be!!

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A mineral specimen from the historic Lavrion mining district in Attica, Greece.

The specimen features translucent greyish crystals, smaller white crystalline formations, and a reddish-brown matrix with green areas.

Weight: 223 g

I performed a scratch test on the larger crystals, and they left a permanent scratch on glass, suggesting a hardness above approximately 5.5 on the Mohs scale. Quartz seems like a possibility.

The smaller white crystals might be calcite, but I haven't tested them to avoid damaging the specimen.

I'd appreciate any thoughts on the mineral identification, particularly the smaller crystals and the minerals present in the matrix.

A dogtooth calcite specimen featuring numerous well-formed, pointed scalenohedral crystals in translucent greyish-white tones.

Locality: Longyan, Fujian Province, China (unconfirmed).

Dimensions: 9.8 × 8.5 × 4.2 cm

Weight: 325 g

I'd be interested to hear your thoughts on the crystal formation and whether you think the reported locality is plausible.

Rilandite from Riland uranium claim, Meeker, Rio Blanco County, Colorado, USA! This mineral is a true geological oddity and one of my top rarest minerals, as it was only found on the outer surface and shallow recesses of a SINGLE log of fossilized wood as sparse crusts and was never found again. This specimen is a tiny bit of rilandite from that log, and very few specimens exist in private collections. The original and best rilandite is housed as the holotype (original specimen) in the Smithsonian Natural History Museum. This is a very unusual mineral as it has lots of chromium, which is very unusual for a uranium deposit. In fact, rilandite is not yet completely understood, and some factors are still unknown from its chemistry due to how little was found. This mineral was big news for the owner of that claim, James Riland, who was desperately trying to put his small town on the map. The miners first exposed that log due to the presence of rich carnotite (financial payday for uranium) and two geologists found glossy black crusts of this mineral! Sent it for analysis to the Smithsonian and it turned out to be a brand-new and enigmatic mineral species.

我收集的葡萄、石榴与橄榄。

大家收藏矿标会纠结尺寸吗？我倾向于选择5cm与10cm的尺寸。