This rock looks just like the Red Jasper Rock, but I do not know the process that led to its formation.

Thanks for sharing this great photo. Unfortunately, it doesn't provide enough info for a definitive answer. However, it does allow us to raise some questions that might provide the answer. It appears to be a red rock with polygonal fractures lined with a white crystalline material. Is the bulk of the rock composed of the red material or is it a surficial coating on black basalt? Does it break with concoidal fracture suggestive of chert (jasper?) or does it break in a more irregular way. Does it appear to have grains and/or clay or is it glass-like? The large white patch on the left appears to have a vertical lineation suggestive of slickensides. Is that correct? If one was to expose more of the crack surfaces, would you see more slickensides? In the quarry face, is this an isolated patch of red rock or does it form a laterally-continuous layer? If it forms a layer that sits directly on the basalt and the slickensides are common, I'll suggest that this is a paleosol and that the white material fills polygonal cracks that formed early in the soil and the slickensides are pedogenic. The red color of the rock would also suggest a soil developed in an arid climate on an iron-rich source such as basalt. This rock also looks like clinker. Clinker forms when coal beds burn in the subsurface. Did the basalt come in contact with coal? The pattern of the cracks makes me prefer the paleosol interpretation. Thanks again for the fun question.

It may be Obsidian. It is a form of volcanic glass and formed when lava extruded from the vent of volcano and cools rapidly.

Dear Kevin,

It is pity that we don't know if this rock harder than glass...?

Generally, it could be jasper or rarely red obsidian (or better to say tachylyte?)

However, if it is softer than glass and this white veins is composed by calcite - it could be red limestone or marble...?

Cheers,

Milan

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Dear Kevin,

You have gotten three excellent responses...

You are able to determine practically on the site what it is:

(using acide: HCl, or glass plate), If you break a fist-sized piece of it, its weight will also tell you a lot...

If the fissure contains SIO2... with a big probability it is a jasper... which is formed in Precambrian (?)... If Jasper(more than 70% onto base of your photo) can be totally determined its formation (you need the genesis of Jasper, you need explanation how is it went in in the basaltic lava...

Regards,

Laszlo

Thank you all for your comments, answers, and recommendations! They helped and gave ideas regarding this rock that strangely occurs in the Bangangte basalt quarry. More pictures are added for a better viewpoint of experts. I investigated this quarry in 2014 and because I was strangely surprised, I tested the sample in many ways even using my tongue. The rock was compact, crumbly, and not a specific taste, with very low content of silicate almost none. I got confused because they showed column structures (same as basalt) that are filled out with white material. I personally believe it might be a paleosol but how we explain the process that led to the development of such structures? Did it form at the same time as basalt? There's no coal in the area (cf. Keith Winfree). Attached docs include more pics and a copy article on the Bangangte basalt published in 2020.

Again thank you for your comments and answers, this project was conducted in 2014 and between 2017-2021 I worked on orogenic gold mineralization (Cameroon), and my future research is focused on sedimentary hosted Cu-Co deposits. It is a new area and I will be happy to receive any recommendation or advice or reference that may help to consistently elaborate the project.

Thanks,

These photos help quite a bit. I think they support the paleosol interpretation as does your observation that the rock is crumbly. The paloesol hypothesis could be tested with further observations based on this scenario: the lower part of the basalt in the outcrop was weathered prior to the upper part being emplaced. To test this idea one could look for evidence that there are two separate flows (Does the basalt above the red rock show evidence of a chill zone at the base? Does the underlying basalt have any indication of vesicles related to degassing at the top of a flow?). If fossil root traces (rhizoliths) could be confidently identified, that would be quite compelling evidence. One useful implication of this hypothesis is that the boundary between the two postulated flows could be a migration pathway for fluids. The close-up photos of the fracture fill suggest that there has been major fluid flow through them (based on the amount of cement and size of crystals). If this hypothetical surface could be mapped, one might gain new ideas about how fluids deposited economic mineral deposits in this region. Thanks again for the interesting question.

Thank you very much Keith for your constructive comment. I think I will get back to the field for more observation.

Dear Kevin Azeuda ,

From your new information, our previous erronous comments and new photos between others exists the next conclusion:

Your suggestion have to be considered with the remark of Keith Winfree too.

We do not have photo from bigger distance to have opportunity to have better imagine about volcanic, magmatic-'sedimentary' body.. It seems It seems brecciated,... It needs determination of matrix (solí)

Only with a careful study can you determine... that how the sol and other chemically altered material get into the fragments of basalt...

The situation from added photos gives a more complex situation... Try to make your interpretation in most simple way... Try to collect more and more useful information... If you go in site bring with you magnet and HCl

I have no experience sedimentary hosted Cu-Co deposits... In such a case it is important you have information about known sedimentary hosted Cu-Co deposits...

Etc..

I have to go to clothes selling...

Regards,

Laszlo

Thank you very much for your comments Mr. László.

Cheers,

Kevin

For clarification, my upcoming project about the copper-cobalt deposits is not in the same area. It's a totally different project located in the Central African Copper belt.