"Rock Hound's" Webquest
Mystery Rock 2
kind of a rock is this?
Where Found? |
Rock Formations? | Layers? |
Together? | Geology Tests? |
did I find this rock?
I did a lot of hiking in Wrangell
St. Elias National Park and saw there were lots of
rock formations are in the area where I found this rock?
I did a lot of hiking in Wrangell
St. Elias National Park and discovered a lot of evidence that volcanoes
were once active there. Along the Skookum Volcano Trail, I explored
lava flows and marveled at towers of layered lava rocks.
my rock sample come in layers?
Sedimentary rocks often form in layers as seen in much
of my hiking in the Gates of the Artic National Park. The rocks that I
am trying to identify are not formed in layers.
My Rock Does Not Have Any
Layers Like the Rock in the Picture Above.
my rock sample look like a bunch of rocks smushed
Conglomerate rocks form by rocks pressing together to form a
new type of rock as seen in much of my hiking in the Denali National
Park. The rocks that I am trying to identify are not formed by having
many pieces smushed together.
My Rock is Not Smushed Together Like the One
in this Picture
would a geologist test this rock?
I found out about
Mystery Rock #2
||What is the grain
size and texture of your rock? Are there flecks of shiny
The grain size is very small, the texture is very
rough with many crater like holes in the surface, and
there are a few flecks of white, sand-like material
embedded in the rock.
||Look at the sample
and determine its color - white, black, green, clear, etc
The rock is brown with some shades of darker brown and a
few light flecks.
Look at the sample to determine if the mineral is metallic
in appearance (looks like a chunk of metal) or non-metallic
(doesn't look like a chunk of metal).
There are no shiny flecks.
Scratch the unknown rock with a known hardness to determine
which is harder. Continue doing this with harder or softer
minerals from the kit until the hardness is determined.
The sample can be scratched by pressing down hard
with a knife so I would say it's hardness
is around 5 on the Mohs hardness scale.
Rub your rock across a piece of tile (unglazed
side) and determine the color of the
The sample makes a brown streak.
Examine the mineral for areas where the mineral is broken.
Is the break irregular or smooth?
Where the rock was broken, it has many indentations and parts
sticking out. The fracture was irregular.
First, I made an educated guess at what type of rock this
was. Then, I compared the data I collected on this rock to
information that I found in National Audubon Society
Field Guide to North American Rocks and Minerals. If I identified
the rock sample correctly, I made an identification card. If I felt
that was not the correct identification, I went back and reviewed my data
and made another educated guess.
||No Shiny Materials
Hound": Matthew Durant Boston, MA
want to learn more about igneous rocks
Igneous Rock Is Formed Good description of how igneous rocks are
formed. The site offers several examples of igneous rocks.
Rocks Excellent descriptions on how igneous rocks are formed.
Igneous Rocks Great images and descriptions of igneous rocks that
are formed intrusively.
rocks Great images of igneous rocks.
of Volcanoes Great images of the different types of
A great description of how a volcano works.
Ask-A-Geologist questions are answered by USGS employees, retirees, and
contractors who have volunteered to participate in the project.
Spread the Word!
iwebquest.com | Link
to Us | Contact Us
© 2004 All information provided here is proprietary of iwebquest.com®.