May 2012 Program

Larry Bradbury, Meteorite Man

Our special guest this month will be Mr. Larry Bradbury. He will be speaking on a very interesting subject: Meteorites (Rocks from Space). He will bring many of his collection pieces to the club meeting on Thursday May 3, 2012 @ 7:30 pm and will answer all your questions about meteorites. You don't want to miss this!

REGULAR MEETINGS ARE HELD ON THE 1ST THURSDAY OF EACH MONTH @ 7:30 PM AT:

NORTHRIDGE UNITED METHODIST CHURCH-9650 RESEDA BL. NORTHRIDGE, CA 91324

Guests are always welcome at our meetings and events

April 2012 Rock of the Month

      Limestone

 

 Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate. Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera, which is a species of marine plankton. Limestone makes up about 10% of the total volume of all sedimentary rocks on Earth. 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. Most cave systems are through limestone bedrock. Limestone has numerous uses, including as building material, as aggregate to form the base of roads, as white pigment or filler in products such as toothpaste or paints, and as a chemical feedstock. During regional metamorphism that occurs during the mountain building process, limestone recrystallizes into marble.