Brookside Memorial EarthCache

This Earthcache is located at the Brookside Memorial.

This park was dedicated in 1994.

The Veterans Memorial has over 2,000 names from veterans of all wars.

Do be respectful of other people here.

The Jackson Parks and Rec department has approved this earthcache

Marble

Marble is a rock resulting from metamorphism of sedimentary carbonate rocks, most commonly limestone or dolomite rock. Metamorphism (see below) causes variable recrystallization of the original carbonate mineral grains. The resulting marble rock is typically composed of an interlocking mosaic of carbonate crystals. Primary sedimentary textures and structures of the original carbonate rock (protolith) have typically been modified or destroyed.

Limestone

Is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO₃). Limestone makes up about 10% of the total volume of all sedimentary rocks. The solubility of limestone in water and weak acid solutions leads to karst landscapes, in which water erodes the limestone over thousands to millions of years.

Gabbro, Granite, and Basalt are all formed from magma.

Gabbro when magma is trapped single “intrusive” (meaning = under the surface) layer, it will cool extremely slow and form gabbro. Gabbro’s texture will be even throughout, and the mineral grain size will be very small. If this same magma gets “metamorphized” (Meaning = pushed up from deeper in the earth’s crust) this pressure will force the component materials to “coalesce” (meaning = combine elements in a mass or whole) forming larger crystals. This process take a LONG time and is “intrusive” (meaning = under the surface). This will form granite. But if the same magma cool rapidly because it comes in contact with air or water, which would be “extrusive” (meaning = above ground) it will form basalt. Gabbro is the blackest granite that is possible. Basalt is also black not fails to compare to Gabbro.

Gabbro

Granite

basalt

Some other definitions

Luster: How light reflects off of a rock or mineral types of Luster:

• Metallic -- Metallic Luster refers to minerals that look like a shiny metal.
• Vitreous -- Also called glassy.
• Resinous -- Minerals that look like resin (a little bit like the look of plastic).
• Pearly -- Minerals with a pearl-like, iridescent luster.
• Greasy -- Some minerals look like they have a thin layer of oil on them.
• Silky -- Minerals that look like fibers of silk.
• Adamantine -- This describes minerals with a brilliant luster, sometimes with colors flashing in the mineral.

Metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids.

**Logging requirements**
DO NOT POST ANSWERS IN YOUR LOG.
Send the following answers to me via email.

The text "GC569B9 Brookside Memorial" on the first line

At the posted coordinates look at the “Brookside Park Memorial To Veterans of All Wars” stone.

1. Examine the polished rock face and determine color and crystal size.
2. Based on the descriptions above is this a Marble (interlocking mosaic of carbonate crystals), Gabbro (no visible crystals, high polish), a granite (visible crystals, especially quartz, high polish) or Basalt (dullish, no crystals, no polish)?

At waypoint “Question 2” look at the wall (The side with names).

1. Examine the polished rock face and determine color and crystal size.
2. Based on the descriptions above is this a Marble (interlocking mosaic of carbonate crystals), Gabbro (no visible crystals, high polish), a granite (visible crystals, especially quartz, high polish) or Basalt (dullish, no crystals, no polish)?

I have earned GSA's highest level: