Igneous Rocks
This stone can float in water.
What is a pumice stone?
This is the most common rock-forming mineral in the Earth's crust.
What is Feldspar
The way light reflects off of a mineral.
What is luster?
The first Thursday of the month (September- June).
When does the Capital District Mineral Club always meet?
We hold these at our June picnic and December banquet.
What are auctions?
This kind of igneous rock is formed when magma cools beneath the Earth's surface.
What is Intrusive igneous rock?
These are two ways that sediments are formed.
What is weathering and erosion?
The scale that is used to measure the hardness of minerals
What is Moh's Hardness Scale
To promote and encourage the study of mineralogy and other allied sciences.
What is one of the purposes of the CDMC?
This is the February birthstone.
What is Amethyst?
This type of igneous rock forms when lava cools on the Earth's surface.
What is Extrusive igneous rock?
These 2 things cause metamorphic rocks to form.
What are heat and pressure?
Another way to identify minerals; it leaves the color of the powder behind when rubbed against a rough white tile.
What is streak?
When you become a member of the Capital District Mineral Club, you also receive a membership to this.
What is the Eastern Federation of Mineralogical and Liapidary Societies?
This is the name for a rock of no value to a geologist. (perhaps slang?)
Leaverite (As in "leave 'er right there")
This type of igneous rock is black with a glassy texture. We looked at it in class.
What is obsidian?
For an Igneous rock to become a sedimentary rock, what needs to happen?
What is weathering, erosion, compaction, and cementation?
The property that causes a mineral to glow under ultraviolet light
What is flourescent?
Robin Hill did a presentation for the club on 11/6/2025; the topic he discussed at that meeting was about the minerals from this area.
What is Franklin, NJ?
The softest mineral.
What is Talc?
This determines the size of crystals that form in igneous rocks.
What is the cooling rate of the magma or lava?
The type of sedimentary rock that can contain fossils.
What is organic sedimentary?
You can see this property just by looking at a mineral. Many minerals can be several of these.
What is color?
The first meeting of the Capital District Mineral Club was held during this year.
What is 1956?
Diamonds from this country are currently illegal to import into the United States.
What is Russia?