What are these ondular petrified patterns on the rock?

Is this one you displayed before? It looks like a "bull quartz" vein and the other side of the rock has been eroded away or else its been fractured off.

DO THIS

1SOAK the rock in vinegar or a very dilute muriatic acid (HCl)
We normally use HCl for anything carbonate but I only use a dropper bottle with 0.! N cid)
Acetic works slower but you can see it fizz.
If it fizzes, its calcite or limestone, if it doesnt fizz at first but fizzes AFTER you take a small piece and pulverize it and then drop some acid on it, then you hve MAgnesium Calcium Carbonate (DOLOMITE). If it doesnt fizz at all, Id say its quartz (Which , I am 95% sure)

The metallic looking stuff is interesting but without a microscope or Xray, I cant give a definitive answer.

See if you can make a little magnet stick to it, if not, its not enough iron , so it may be silver or low concentration nickel sulfide.

Then, hold a lit match to the metallic looking stuff and see if you can smell sulfur. If so, its a sulfide min, if not, its an oxide

This rock is different from the previous, I found it in Tijuana. I had found the previous one in Mazatlan. I hadn't looked it thoroughly, I had just focused in the mud like covering, indeed, the rock is mostly quartz, with a thin layer of calcite. So "bull quartz" aception fits perfectly. Some of this quartz is green and at some parts of the rock looks like the green quartz got obscured, so it gives it the metallic appearance, for it is not metallic. The muddy like coat would be just petrified mud? I was told it could be lava, but as I know there is no lava in the surroundings, I have never seen lava in my life and I don't know how does it look like when it solidifies, so I cannot tell.

If you wash the mud off and , if you had enough, you could do severall tests, but the easiest of which is to look at it under a microscope. You will be able to see whether the edges of the grains are sharp or rounded. That should answer much about its source. Mix it up in water and let it dry and then run a magnet over it and see whether you pick up any iron oxides. Most all igneous and metamorphic rock grains have some iron oxides in em whereas most seds dont. (Unless theyre recent chunks torn from a plutonic or metamorphic source)

I was collecting a couple of other interesting rocks in the area near the promontory, I was thinking of posting each of them to know what they are, but suddenly I made a connection with all of them, hypothesizing that a meteorite hit the area or nearby, the intense heat made this rock covering melt like lava. I am collecting some photos for another post.

If thats a fact, there should be some footprint on the geology map and Ill bet its very deep.

Theres a book by a giy named WILEY POAG called "The Chesapeake Invader". Its really a techy geology book but written in a popular format. Its about a big metteorite that hit the lower Chesapeake BAy in the pre Holocene times as the glciers were receeding and the peri glacial outwash plains "Covered over" its footprint with snd and gravel layers.
SO Wiley started with ome wel data where wells in one area of the James River Basin were howing very high Transmissivity values and the drill cuttings were coming up like shttered breccias. SO the USGS started coring to about 5000 feet and there was some evidence of "shocked quartz" (a spot on detereminant of a meteorite strike or a super volcano). Since there was no suoer volcano evidence they started doing magnetometer surveys till they found the dead center of the HIT.
Its a good read and it gives up lots of information about how geologits think without being tupidly overtechnical.
"

It sounds very interesting, unfortunately I couldn't get it in pdf for free. It is incredible how these mega craters passed unnoticed until recent years. I read that in Germany, I don't remember the name of the impact crater, rocks founds nearby were named accordingly to supposed volcanic origin and after the discovery of the crater, they have to be recataloged.

Heres some stats on the Nordlinger Ries crater(Its catalogued by LAT?LONG). Maybe Walter cn give us some better locations. Im aware of the Sechstein basin crater, maybe this is the same one

http://toolserver.org/~geohack/geohack.php?pagename=List_of_impact_craters_on_Earth&params=48_53_N_10_34_E_&title=N%C3%B6rdlinger+Ries

Indeed is Nordlinger Ries the crater about what I read.