Maui Earthcache 2-fer EarthCache

Site I:  "Bell Rock"

Pohaku Kani or "bell rock" is a basalt boulder near the side of the road. Hit it in the right place (mauka or mountain side) with a rock and it might sound like a bell or at least we used to think so small kid time.

Site II: Olivine Pools

A short hike down the well marked trail from the posted coords.  Please wear close toed shoes (no flip flops or slippahs) as the lava rocks on the trail are VERY sharp will and have cut their fair share of toes in the past.  Also be forewarned- there are no lifeguards here.  There was at least one case where tourists were swept out of the pool by a large wave and drowned (Heed the warning sign at parking).  As such, although it may be tempting it is recommended that you stay dry at this cache.  That being said, please stop and enjoy the tidal pool.  You can enjoy a variety of tropical reef fish and crustaceans with the occasional octopi thrown in.

This cache was rated for just the hike to the overlook at the top.  If you choose to get a closer look at the pools the terrain rating maybe a or

The Olivine Pools are naturally occurring tidal pools formed on a lava shelf.  These pools were named after the encrustations of this semi-precious gem in the surrounding lava and sandstone which give them their unique and beautiful greenish color. 

You may also be fortunate enough to find some Volcano bombs along the way.

From rockcollector.co.uk:

Chemical Composition: (Mg,Fe)2SiO4  Group: Silicate  Colour: Yellowish green, Olive green, Greenish black, Reddish brown  Streak: white  Hardness: 6.5-7  Density: 3.3-3.4  Luster: Vitreous  Cleavage: Good x1, Distinct x1

Olivine is a rock-forming mineral which occurs in mafic (where the minerals are usually dark in colour and have a specific gravity greater than 3) and ultramafic (silica-poor) igneous rocks such as basalt, gabbro, troctolite and peridotite. Dunite, for example, is a rock composed exclusively of Olivine. Olivine, or high pressure structural variants of the mineral, constitute over 50% of the Earth's upper mantle, making it one of the Earth's most common minerals by volume. But Olivine is not only common on Earth. Studies of the Martian spectra carried out by Todd Hoefen and Roger Clark at the U. S. Geological Survey in Denver have shown that Olivine can also be found on Mars. This was confirmed by NASA Goddard Space Flight Centre which reported a 30,000-square-kilometre area of Olivine-bearing rock in the Nili Fossae region, north-east of Syrtis Major. Olivine has also been reported in samples collected from the Moon and the Wild2 comet. (A NASA spacecraft named Stardust collected the particle samples from the tail of 81P/Wild comet in 2004.) Analysis of these extra-terrestial samples showed a substantial amount of crystalline silicates such as Olivine, Anorthite and Diopside in the material. Mg-rich Olivine has also been discovered in a number of meteorites, in particular pallasite - a stony-iron meteorite which contains crystals of Olivine suspended in the nickel-iron matrix. A good example of such meteorite is the Glorieta Mountain meteorite.

An interesting idea which is now being tested, is to use of Olivine to sequester CO2 from the atmosphere. Olivine reacts easily with the CO2 in air. So for example, all the CO2 produced by burning a litre of oil can be absorbed by less than 1 L of Olivine. The end-products of the reaction are silicon dioxide, magnesium carbonate and small amounts of iron oxide. Furthermore the process is exothermic which means that as a side effect heat is produced which can be used to generate electricity

From USGS:

Volcanic bombs are lava fragments .larger than 64 mm in diameter. Many acquire rounded aerodynamic shapes during their travel through the air. Volcanic bombs include breadcrust bombs, ribbon bombs, spindle bombs (with twisted ends), spheroidal bombs, and quot;cow-dungquot; bombs."

To log this earth cache please complete the following and post pic / email me the answers. (Go ahead and log the smiley and sorry dont exepect an acceptance email. I'll contact you if your answers are unacceptable)   Do not include the answers as part of your log or it will be deleted (even if encrypted).

1)	Measure the approximate diameter of the bell rock.  Calculate the approximate amount of time for the sound to get from one side of the rock to your ear. (Please take some liberties here and assume normal conditions, ex. sea level, 20/21 degrees C etc).  Note: sound travels much faster through basalt then air.
2)	Take a picture of you with your GPSr visible with the pools in the back ground (please record your GPSr reading in your listing).  Note:  If you do not feel able do not venture down to the pools themselves.  You can still appreciate their beauty from above.
3)	What is olivine (gem quality) also known as (I think the Canadians may have an edge here
4)	What are some commercial uses (other then gems) for olivine
5)	How are volcanic bombs formed?
Bonus:	Take a picture of a lava bomb

TERMS & CONDITIONS:

You assume any and all risk associated with finding this cache. Geocaching can  involve risk to both person and property. There are many variables including, but not limited to, weather, fitness level, terrain features and outdoor experience that must be considered prior to seeking this or any cache. Individuals in poor physical condition should not attempt this cache. Be prepared for your journey. Always exercise common sense and caution. In no way shall the cache owner be liable for any direct, indirect, punitive, or consequential damages arisingout of searching for this cache. By partaking in this cache hunt you are agreeing to the terms and conditions set forth above.