Silver?? Bar of??

[JUDDZILLA]

I collect Native American artifacts and crystals/rocks. I found this recently and am puzzled. It appears to have been 2 separate rectangular pieces and attached or someone had started to attempt to split 2 rectangular piece out of it because on all 4 sides is a line you can see directly down the center. It is very heavy and very hard. I took a Dremmel tool to it and it didn't do much but eat up my bit and dull its shine. Very hard to scratch with steel blade. Did shave a bit of dust off and it was greyish white. I've only been collecting about 2 years any help would be appreciated. Thanks.

[creskol]

Looks like quartz with natural fracture lines to me, but I am no expert.

[Cubfan64]

No expert here either, but it looks like natural fracture lines to me as well.

[Gunrunner61]

I too have to agree with the last two posts natural fracture lines in quartz.

[Twisted One]

Looks like quartz or some sort of marble. I know typically quarts will shatter with very little force, but the milky quartz can be very tough to break, and usually just chips away in tiny flakes.

[scepter1]

Natural quartz.

Rich

[creskol]

This is Super hard I dropped it TWICE on my back concrete patio and it chipped the patio, Not the Crystal/mineral?? itself. It is dull because of the Dremmel I took across it. The parts where I didn't hit still are shiny glitter like. The cracks are EXACTLY straight down the middle on all sides. These are the reasons I am a bit puzzled. I have an Enormous amount of all different kinds of quartz but this is different more than its size. Thanks for all your help guys. Is there any other possibilities

Based on its size, maybe it's a half pint instead of a quartz. By the way .. Welcome to the forum!

[Gecko]

Aloha Juddzilla,
This is a piece of massive quartx that has natural lineal fracture lines highlighted by iron oxidation (possibly from tiny inclusions of pyrite)

http://www.rocksforkids.com/R&M/quartz.htm

Most quartz found on the earth's crust is massive - namely it is not in crystal form. Quartz is one of the most common rock-building minerals. It is most often found in large massive chunks. When quartz is massive, it is a white, milky color. It is also sometimes called milky quartz. white colour is caused by gas bubbles and liquid being in the quartz as it is formed. Quartz is very hard and very common.
Because it is hard, it will scratch many rocks. Many rocks have quartz in them and that is why they are hard. Quartz breaks with very sharp edges that easily scratch people and things.

see this image .... it also has a brown line... though fainter than yours

http://www.quartzpage.de/px/rc_de_aue_Q494_1_tmb.jpg

text that goes with image is as follows:

Because hot brines that enter a crack cool rather quickly and precipitate a lot of material in that early phase, many veins show a symmetric zoning. The outer parts bordering the host rock are mostly made of milky quartz while the core is made of more translucent quartz or even clear crystals.
The specimen to the right is a small piece of a hydrothermal quartz vein. There is a brown line running through the base of the specimen that separates two quartz veins that formed successively. emphasis mine
It is difficult to say which part is older, the upper or the lower, but if we assume it is the lower, the following happened: A crack formed in the host rock and was filled with hot brines. First milky quartz crystals grew, seen at the base of the specimen and immediately below the brown line. The crystals continued to grow into the gap from both walls, almost filling it out completely (there's a little pocket left near the middle of the lower vein). Note the sandwich structure with a darker core and a brighter border zone. Then the crack widened again, this time much more than before. The crack did not run through the freshly grown crystals, but along the upper border of the vein, along the brown line.

Text link: http://www.quartzpage.de/gen_occ.html


hope this helps you
Cheers