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found some rock, will it knap? (added pics)

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StickMan47:
Let me start off by saying that I know absolutely nothing about knapping. I been makin some bows and arrows and want to start collecting material for knapping my own arrowheads at a later date. I'm the guy that checks out all y'alls pics you post and drool at the stuff y'all knapp!

So today I stopped at my local nursery supply for some Christmas gifts for my mom. This is one of the larger nurserys in my area and I noticed a section with rocks and mulch and gravel. There was a section with fist sized rocks and I thought they might be knap worthy. I am located in southeast Texas if that matters. The sign labeling the rock called them Bull rock. I think this is just a size reference though because I don't recall reading anywhere about "bull" rocks. I looked at a few of them and they have the outer appearance of a kinda rough surface, however there were some pieces that had chips broken off and it looked similar to the stuff I see y'all knapping. It appeared to be kinda milky ranging from a light grey to dark grey and very smooth. So I gathered up 5 of them and was gonna buy them. The lady working there said they only sell them by the yard! Well I wasn't buying a yard of rock! The wife might have liked it because she'd have me building flower beds for weeks with all that rock! Long story short, after I bought several plants and a few pots, the lady give me the 5 rocks for free after I explained what my intended purpose for them was. I thought that was really nice of them, I wish I could knap so I could make them a little arrowhead display.

So what should I do, are they good rocks or flower bed decorations? I'll try to get some pics up soon so y'all got something to look at.

caveman2533:
Given your location and knowing that they use gravel for landscaping and it is most likely local rock, you may have stumbled on a great source. Show us some pics. try to take a flake off with a hammerstone.

Tower:
Most of it will need a little heat, but every now & then you will come across hi grade stone.   I've made a lot of points out of bull gravel.   

StickMan47:
Caveman I ain't got no hammer stone at the moment, no knapping tools in fact. I'm working on arrows right now, I'm slow to say the least! Mostly I'm just hopin I got some decent rock.

Tower, yea I figured on heat treating, I have been doing a lot of reading. Long time reader, first time poster  :D

Got pics uploaded to PB.

StickMan47:
Here's some pics, hopefully!!

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