Bar Island Bar
Bar Island Bar | 2016 | Gemma Venuti
These landforms are created when glaciers move over land shearing off material from the side of the land form they move over first and plucking material off the side they leave.
Roche moutonnee
Veiw from the Bar Harbor Shore Path | 2014 | Sarah Hall
These landforms are created when glaciers move over land shearing off material from the side of the land form they move over first and plucking material off the side they leave.
U-Shaped Valley
Park Loop Road Acadia National Park | 5.21.16 | Gemma Venuti
U-Shaped valleys on MDI are a clue to this island's glacial past. As glaciars miles high made their way across the land they eroded and weathered the ground beneath them into the shapes we see today.
COA Beach
COA Beach | Winter 2016 | Gemma Venuti
The College of the Atlantic Beach is made of pebbles and rocky outcrops. The out crop on the left is comprised of the Bar Harbor Formation which is a meta sedimentary rock. The one on the right is a Gabbro-diorite intrusion covered in crecentic fractures.
Glacial Polish
Cadillac Mountain | 11.11.14 | Gemma Venuti
Glaciers carrying rough material like sand and pebbles polish rocks by moving over them and grinding their surfaces.
Glacial Erratic
Bar Harbor Shore Path | 10.9.14 | Alba Mar Rodriguez
Large rocks carried by glaciers from one location to another. They are usually not the same type of rock as the local bedrock.
Basalt Dike
Park Loop Road | 11.11.14 | Alba Mar Rodriguez
Dikes are igneous intrusions into bedrock. They often form in pre-existing fualts or fractures.
Fractures
Cadillac Mountain | 11.1.14 | Alba Mar Rodriguez
Fractures are cracks in rocks that form as a result of tectonic activity.
The Shatter Zone
Somesville Boat Launch | 10.11.14 | Gemma Venuti
A boulder comprised of large chunks of gabbro and basalt inside a granite matrix.
Crecentic Fracture
Cadillac Mountain | N.D. | Unknown
These fractures are created by glaciers. They are much less reliable than glacier striations in displaying the direction of glacial movement.
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Mineralized Zone
Havey Quarry | 5.25.15 | Hiyasmin Saturay
A mineralized zone at the Havey Quarry. This zone was most likley a product of a balsatic intrusion close by.
Minerals:
1. Lepidolite (K(Li,Al,Rb)3(Al,Si)4O10(F,OH)2)
A purple mica with a hardness of 2.5 - 3. The purple colour comes from its lithium content. This mineral shares the same hexagonal shape as biotite and muscovite mica, but is often much smaller.
Picture modified after: https://en.wikipedia.org/wiki/Lepidolite
2. Muscovite Mica KAl2(AlSi3O10)(F,OH)2
Just like Lepidolite, this mineral has a low hardness of 2 - 2.5. It exhibits the same hexagonal shape as Lepidolite and Biotite, but is a pearly white instead of black or purple. A specimin that contains many sheets is called "A book of mica".
Picture modified after: https://en.wikipedia.org/wiki/Muscovite
3. Watermelon Tourmaline (Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6(BO3)3(Si,Al,B)6O18(OH,F)4 & Quartz SiO2
This is Maine's state mineral and is named after its' vivd green outside and pink inside. It has a hardness of 7 - 7.5 and is rarely found in gemstone quality. Completely black versions of this mineral are called schorl.
Quartz is one of the most common minerals in the world and has also has a hardness of 7. Gem quality specimens are called amythist. According to wikipedia (2015) the quality of quartz can be told by its' hardness. If it's lower than 7, the quality isn't as good.
Picture modified after: https://en.wikipedia.org/wiki/Tourmaline
4. Feldspar KAlSi3O8 - NaAlSi2O8 - CaAl2Si2O8
There are many kinds of feldspar. The formulae above are those of potassium feldspar and plageoclase feldspar. The feldsoar in the picture above is plageoclase. Felspar generaly has a hardness of 6.
Picture modified after: https://en.wikipedia.org/wiki/Feldspar