are these rocks adecuate? anybody can recognize?? - Aquarium Advice

kostasonia · 08-29-2006, 10:12 AM

Does anybody know what type of rocks these are?

I threw vinegar on them and no bubble apeared. Are they ok??

evercl92 · 08-29-2006, 11:08 AM

Judging by the picture, the black one looks like it could be fairly soft, and thus probably not aquarium safe. The white/pink one though looks fairly hard, probably post-volcanic rock. Can't really tell what the black one is, would need a closer picture. I assume you scratched the rock, then used the vinegar? Assuming you did, the one on the right looks like it may be quartz, which is perfectly fine for your aquarium. My guess on the black one would be a piece of coal. You can get a container of water, and place the rock in it for a week. Check pH, kh, gh before and after and compare.

kostasonia · 08-29-2006, 11:24 AM

no.. actually the black one is the same hard as the white-pink.

why should I have scratched the rock when used vinegar??...

evercl92 · 08-29-2006, 11:32 AM

You need a fresh surface to test on. Minerals and other sediments can deposit on the outside of the rock, that wont come off during normal scrubbing or cleaning.

JDogg · 08-29-2006, 12:29 PM

white one is probably marble, crush some up and then do acid test, marble will not react unless you increase the surface area of the sample you are testing, (need powder form)
does it have glitter-like crystals? if it does it is quartzite

black (may) be a very fine grained mafic igneous rock, like a fine grained basalt, or a semi-metamorphosed shale

hope that helped

08-29-2006, 10:12 AM	#1
kostasonia Aquarium Advice Freak Join Date: Aug 2006 Location: Barcelona, SPAIN Posts: 212	are these rocks adecuate? anybody can recognize?? Does anybody know what type of rocks these are? I threw vinegar on them and no bubble apeared. Are they ok??

08-29-2006, 11:08 AM	#2
evercl92 Aquarium Advice FINatic Join Date: Jul 2006 Location: Groveport, OH Posts: 625 Images: 5	Judging by the picture, the black one looks like it could be fairly soft, and thus probably not aquarium safe. The white/pink one though looks fairly hard, probably post-volcanic rock. Can't really tell what the black one is, would need a closer picture. I assume you scratched the rock, then used the vinegar? Assuming you did, the one on the right looks like it may be quartz, which is perfectly fine for your aquarium. My guess on the black one would be a piece of coal. You can get a container of water, and place the rock in it for a week. Check pH, kh, gh before and after and compare. __________________ "... if any one specie does not become modified and improved in a corresponding degree with its competitors, it will soon be exterminated." - Charles Darwin

08-29-2006, 11:32 AM	#4
evercl92 Aquarium Advice FINatic Join Date: Jul 2006 Location: Groveport, OH Posts: 625 Images: 5	You need a fresh surface to test on. Minerals and other sediments can deposit on the outside of the rock, that wont come off during normal scrubbing or cleaning. __________________ "... if any one specie does not become modified and improved in a corresponding degree with its competitors, it will soon be exterminated." - Charles Darwin

08-29-2006, 12:29 PM	#5
JDogg Aquarium Advice Addict Join Date: Sep 2005 Location: Northfield, MN Posts: 2,222 Images: 12	white one is probably marble, crush some up and then do acid test, marble will not react unless you increase the surface area of the sample you are testing, (need powder form) does it have glitter-like crystals? if it does it is quartzite black (may) be a very fine grained mafic igneous rock, like a fine grained basalt, or a semi-metamorphosed shale hope that helped __________________ Follow my adventures into the land of Nano Reefs HERE http://i111.photobucket.com/albums/n...f/DSC01648.jpg

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

08-29-2006, 11:24 AM	#3
kostasonia Aquarium Advice Freak Join Date: Aug 2006 Location: Barcelona, SPAIN Posts: 212	no.. actually the black one is the same hard as the white-pink. why should I have scratched the rock when used vinegar??...

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Can you recognize possible plant deficiency/	Digitalgerl	Freshwater & Brackish - Planted Tanks	10	08-04-2007 06:41 PM
Anyone recognize this plant?	ringfinger	Freshwater & Brackish - Planted Tanks	8	11-14-2005 08:14 AM
Do all fish recognize cleaner shrimp?	leafyseadragon	Saltwater Reef Aquaria	4	06-23-2005 02:44 AM
Foxface rabbitfish? Anybody recognize these?	zuzecawi	Saltwater Reef Aquaria	6	03-05-2005 10:28 PM