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Post by fernwood on Jan 19, 2019 7:57:45 GMT -5
Sorry of this comes out a little blurry. Phone lens kept fogging up yesterday due to how cold it was in utility room. Started this in early December. When looking at a small slab, it called to me. Did some shaping with Dremel, then threw in tumbler. To me it looked just like a combo of an ice covered road with some black ice peeking through. The same thing I had driven over the previous night when coming home from work. Or, the white areas could be considered a pile of road salt, something that I saw at an intersection. I would like to know for sure what this material is, so am posting a photo of the preform too. The preform photo is the opposite side of what the finished cab will be. To me, it looks like marble. Appreciate input on ID and how it looks to you. Is in combo of pre-polish and final polish now. Thank you. Preform.  As of yesterday.  |
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Post by vegasjames on Jan 19, 2019 8:10:56 GMT -5
Looks like a quartz. Did you do acid or hardness testing?
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Post by fernwood on Jan 19, 2019 8:27:41 GMT -5
CAme from the landscape rock former owners had put in rock garden. It was a mix of pure while and some with a little black. Scratch test indicated about 5.5-6 hardness. Dremel worked well for shaping. Much easier than when using it for Quartz or other 7 and up rocks. The crystal structure is not as fine on this one as with the pure white ones. Dunno if they put a mix of quartz and marble in the gardens. Unfortunately, all gardens are now under 2-3" of ice and another 3" of snow, so cannot get more from them until spring.
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Post by vegasjames on Jan 19, 2019 21:08:42 GMT -5
Marble would be softer. And I would not think it would make a food landscape rock due to softness and reactivity to acids such as acid rain. Maybe a feldspar?
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Post by fernwood on Jan 20, 2019 4:34:01 GMT -5
Maybe feldspar. Will have to wait and see. Thanks for the suggestion.
Marble is used around here a lot for landscape rocks.
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Post by toiv0 on Jan 20, 2019 10:12:33 GMT -5
We packaged a lot of White marble when we had the plant in Waupaca for landscapes. It is now in Amhearst, I would assume they still package decorative rock there. I would pick out some pretty neat pieces that looked like yours also there was a lot with pyrite and some that were bluish. I believe it came for Alabama or GA.
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metalsmith
Cave Dweller 
Member since October 2012
Posts: 1,537
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Post by metalsmith on Jan 20, 2019 12:20:49 GMT -5
It looks a little like psilomelane dendrite in quartz. If there is a blue-grey hint to the dendrite, it might be pumpellyite. Hardness would give away whether you have quartz or marble / feldspar.
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Post by vegasjames on Jan 20, 2019 21:10:43 GMT -5
It looks a little like psilomelane dendrite in quartz. If there is a blue-grey hint to the dendrite, it might be pumpellyite. Hardness would give away whether you have quartz or marble / feldspar. She said hardness 5.5-6. So too hard for marble and too soft for quartz. |
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Jan 20, 2019 22:54:08 GMT -5
If feldspar, then a feldspar granite. Unaltered feldspar inclusions and staining tend to be angular, following the internal lamellae of the crystals and not diffuse veining as in this piece. A predominately white feldspar granite is very possible.
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