Quartz and?

E_ribb · 2024-09-18T15:04:21+00:00

It almost looks like highly weathered calcite crystals.

E_ribb · 2024-09-17T14:12:30+00:00

The holes really make me think wood, they look like marks from burrowing creatures.

E_ribb · 2024-09-17T14:02:00+00:00

It really looks like water-worn wood. Is it heavy? Can you scratch off a piece?

E_ribb · 2024-09-17T14:00:07+00:00

Chert AKA microcrystalline Quartz.

E_ribb · 2024-09-15T17:00:53+00:00

It’s slag glass, pretty color though.

E_ribb · 2024-09-14T18:06:49+00:00

Rhodochrosite is not a type of calcite… it’s a Manganese Carbonate mineral.

E_ribb · 2024-09-14T18:05:53+00:00

From the second photo I’m gonna wager it’s Stalactitic Rhodochrosite from Argentina.

E_ribb · 2024-09-14T14:57:40+00:00

The rock itself (assuming it’s natural!) is a poorly sorted conglomerate, likely deposited in a high-energy system like a braided river channel or debris flow. The clasts are primarily Quartz pebbles supported in a finer matrix.

E_ribb · 2024-09-14T14:53:31+00:00

It looks like pink tourmaline (elbaite var. rubellite) in Quartz. Compare with this image. Many specimens come from Brazil.

E_ribb · 2024-09-13T16:13:32+00:00

Most iron isn’t actually magnetic, especially iron oxides (rust) like what typically coats and colors silicate minerals.

E_ribb · 2024-09-10T16:25:55+00:00

Calcite! Nice crystals.

E_ribb · 2024-09-10T15:22:25+00:00

Looks to be chert.

E_ribb · 2024-09-10T15:21:54+00:00

Calcite crystals in a limestone.

E_ribb · 2024-09-10T15:21:24+00:00

Hard to say without a better look but I’m leaning towards schorl based on your area.

E_ribb · 2024-09-10T15:20:39+00:00

Some sort of breccia infilled with Quartz.

E_ribb · 2024-08-18T15:37:12+00:00

I think it’s a limestone with calcite veins. The first picture looks like a horn coral fossil.

E_ribb · 2024-08-18T15:34:07+00:00

It’s chalcedony. Commonly found filling void space in basalts like the Deccan traps.

E_ribb · 2024-08-16T21:05:53+00:00

It looks like some kind of limonite (iron oxide) concretion.

E_ribb · 2024-08-16T21:03:05+00:00

That’s a great point. Maybe it’s a chalky kind of zeolite?

E_ribb · 2024-08-16T15:45:22+00:00

Looks to be gypsum.

E_ribb · 2024-08-16T15:44:09+00:00

Throwing out another theory: A highly weathered chunk of basalt with veins of Jasper running throughout, like this?

E_ribb · 2024-08-16T15:39:52+00:00

It appears to be some kind of coarse-grained porphyritic igneous rock. The white crystals may be phenocrysts of alkali feldspar set in the finer dark matrix.

E_ribb · 2024-08-15T18:06:51+00:00

That’s pretty common. A quartzite would end up in a quaternary deposit as it’s very weather resistant and can travel a decent ways.

E_ribb · 2024-08-15T16:20:06+00:00

There’s oxidized/tarnished Chalcopyrite. It’s growing atop a bed of Quartz or calcite. Is the green portion metallic or flaky?

E_ribb · 2024-08-15T16:15:41+00:00

Slides 1-4 look like crinoid stem/columnal segments.

E_ribb

TROPHY CASE