What kind of rock do I have?
137980
Yes, it sounds like you have a geode.  The word "geode" comes from a Greek word, meaning "earth shaped".  They can be oblong or shaped like invertebrate fossils. Some are hollow and lined with most beautiful and unusual layers and clusters of various mineral crystals, but others are completely filled by inward-growing crystals.\n\nCheck out this website.  It has lots of pictures of geodes and lots more information.  I hope this helps.
850240
What you describe looks as if it is a gum from the tree(usually)which has settled on the rock and has the natural salts of the rock diffused into it . If you are still in trouble then go to the nearest research Lab to get the exact details of the elements present in this specimen.
695150
This past summer the wife and I took a trip to NC. Spruce Pine to be precise. We went "Rock Hounding" or "Gem Mining" at place called  Gem Mountain.\n\nhttp://www.gemmountain.com/aquamarine.htm\n\nWhile at Gem Mountain we purchased one bucket of minerals and mined at their Aquamarine mine near by.\n\nWe found some nice specimens, but one in particular stuck a nerve, The image of this Aquamarine is posted at my site, Take a look:\n\nhttp://my.opera.com/TheMineralExchange/albums/showpic.dml?album=157930&picture=2347315\n\nOk.. so after viewing the image, Aquamarine's stats are as follows:\nA) : Green-blue\nB) : White\nC) : 2.63-2.91\nD) : 7 1/2-8\nE) : Hexagonal\nF) : Imperfect\nG) : Conchoidal, Uneven, Brittle.\n\nHey Teacher?. did I pass?
655495
Foundation? Foundation?\n\nOn Christ the Solid Rock I stand,...All other ground is sinking sand!
1100973
Identification of a sedimentary facies (or any rock facies, for that matter) requires an intimate knowledge of the type locality of that particular facies, what major minerals constitute the lithogenics, and what the depositional/erosional/tectonic activity of the region was like since the formation of the facies.  \n\nFor example, when I was out west I was able to trace the Navajo sandstone throughout the four corners region, from the Grand Canyon all the way up through Utah.  There were points where the Navajo was the thickest facies, while in other regions the Navajo was very thin and nearly unnoticeable.  In those thin regions, the deposition of the Navajo might not have been as pronounced (sedimentary facies are formed by deposition of sediment), or the facies could have been exposed at the surface much longer than in other regions and subsequently eroded away.  You can determine if this happened by looking for unconformities between the Navajo and the facies above it.  \n\nHowever, there are certain characteristics of the Navajo (Aeolian remnants, highly silicic, slight oxidation) that make it the Navajo formation.  Despite the varying thickness of the facies, you can trace these rock characteristics throughout the American Southwest.  So yes, if a geologist wishes to determine the full extent of a lithogenic facies, they must attempt to trace that facies as far out as they possibly can, which means a lot of survey work.\n\nWhat most geologists do nowadays is check the state geological maps of the regions they're interested in and look for rock facies that match the facies of the rock they're studying.  Oftentimes facies that are the same facies are given 2 different names in different state geological maps.  If this occurs, the type locality of the rock is determined (IE, the best-represented sample of that rock), and the facies name is given based on the state the type locality is in.
808478
Whilst still below the surface it is called magma. Rocks which from from magma which has not been extruded at the surface cool more slowly (as they are at greater depth and hence higher temperatures) and thus have time to grow larger crystals before solidifying, producing a coarse-grained texture. These rocks are referred to as 'plutonic' and include gabbros, diorites, and good old granite. (You'll notice gabbros are darker due to their higher content of iron, etc - where as granites are a lighter colour as they are more rich in silica).\n\nLiquid rock at the surface is referred to as lava, and cools to form volcanic rocks such as basalts, andesites, and rhyolites (and obsidian, which is a really cool black volcanic glass). Due to cooling faster, volcanic rocks are quite fine-grained: if you look at a granite, you'll see indiviual crystals of the minerals (those little black or shiny silver-ish specks, or the large-ish pink or white crystals of feldspar) whereas to the naked eye, a volcanic rock such as basalt often looks rather like just a grey rock! (Looks pretty wicked under the polarizing microscope though...!)
858632
Typically rocks with a reddish color have a high content of iron.  The color is essentially iron oxide (rust).
699293
zonealarm rock lol\nnd beware of the web
230864
Either go to a local stone quarry...if you have one.  Or maybe try talking to a landscaper...they should have some advise on how to obtain a big rock.  Good luck!
281360
its a rock...\n\npencils...
763336
what are you talking about? you lost 3 rocks, and put back 2 more?
114668
maby let me see what it is
134466
"I Am A Rock" by Simon and Garfunkel.  I think this fits what you're asking.  The link is to the lyrics of the song.  Hope this helps!
830840
Sedimentary rocks ... As QFL 24-7 said you would be dating the formation of the rocks which formed the particles of the rock you are trying to determine its age .. so you will get an older age ...
277283
Are you ready to ROCK?
261483
These are igneous rocks.
51313
The clast is rotating as it's being carried along in the water, and if it hits the substrate with its edge pointing down in the downstream direction, the clast will embed.  So when you're looking at a rock with embedded clasts in it, you can determine the direction of current by measuring the maximum down dip direction on the clasts.  In other words, if the clasts are all dipping down in a certain direction, that's the direction of streamflow when the rock was deposited.