Quartz Core And ?

[Cariboo5]

Found this in a little creek. Moss covered from age and looks well worn. Took a rock hammer and split the main rock in two.
The inside of this half shows quartz and what is attached to the side of the quartz almost looks like concretion but I am not 100% sure.
At first my thoughts were that this may be from a quartz vein that broke off however on the side hills there is no rock formation or
bedrock. Thoughts and comments on what this is are appreciated. Thanks in advance to all...............

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[Eu_citzen]

The "other" stuff also looks rich in silica, to me suggesting hydrothermal alteration. The odd looks likely relate to etching/re-dissolving of material.

 

[Cariboo5]

The "other" stuff also looks rich in silica, to me suggesting hydrothermal alteration. The odd looks likely relate to etching/re-dissolving of material.

Thanks Eu_citzen, this area has a fault running through it and has a high potential for minerals according to the government charts. It is a chore to get in
as this is at the bottom of a steep canyon. Should we come across any thing else interesting I will post pictures.....Thanks again....

 

[Eu_citzen]

Thanks Eu_citzen, this area has a fault running through it and has a high potential for minerals according to the government charts. It is a chore to get in
as this is at the bottom of a steep canyon. Should we come across any thing else interesting I will post pictures.....Thanks again....

Post those pics! I've been hunting a lot of faults and shearzones myself the past year.

 

[hvacker]

I first thought calcite. It resembles a cave rock. I saw a lot of this (or similar) when caving.
The host rocks were limestone and that you found it in a creek I wondered if it was a washout.
Caves are often underground rivers.