From the Mineral Minutes Archives: Thoughts on a Snowy Day – February 6, 2010 – with a Bonus Quiz!
by Dave Nanney, MSDC Member and Past President, and Sue Fisher, MSDC Member and former Editor
[Editor's note: This item appeared in the March 2010 edition of Mineral Minutes]
What do you do when you are in the middle of a record-breaking snowstorm and you just received your Mineralogical Record – January-February, 2010. The answer is you read it.
But when you are the “kids” on the mineralogical scene, there are a lot of terms you are not sure of. Below are a number of terms from the January-February, 2010 edition of the magazine. I looked them up on various internet sites, sometimes several, if the meaning could not be understood, and our Geology 101 textbook . The references are too many to list so I will simply refer to the wisdom of the internet as the source of the definitions.
Note from Sue Fisher, Editor of February 2010 Edition: "I just can't leave good things alone so I decided to turn Dave's great information into a quiz. I have taken Dave's terms and definitions and mixed them up. Can you match the terms with their definitions? Just to challenge Dave a little, I have added a few more terms. Answers are at the end."
__1. Body of rock, which is thick in middle and thin at the edges, resembling convex lens.
__3. Crystalline minerals, framework silicate, most common are plagioclase (tends to be white, gray or blue) and orthoclase (tends to be pink)
__4. Space made by splitting of rock formation
__5. Separable into layers, repetition of layers in metamorphic rock
__6. Structures caused by extension where rigid body is stretched like sausage
__7. Material left after removal of valuable material. Trash minerals where one man’s trash might become another man’s treasure.
__9. “Twisted quartz” where the crystal appears to have grown sideways, slightly twisted with bent crystal faces.
__10. Gneiss from sedimentary rock
__11. Skilled mountain climber and collector of minerals
__12. Soil is made of layers called horizons. Evaporate horizon would be repeated layers of evaporated minerals
__13. Block of earth crust displaced as a unit without internal changes
__14. Large mass thrust over other rocks
__15. Change in constitution of rock affected by heat, pressure, water yielding compact crystalline condition. Because this is not a cause of melting, this is considered a solid state transformation.
__16. Mass of intruded igneous rock that stopped its rise considerable distance before the surface.
__17. Process of mountain formation
__18. Metamorphic crystalline rock which has closely foliated structures and can be split along parallel planes. Medium to coarse grained metamorphic rock containing foliation.
__19. Mechanical Inclusion, and Substitution
__20. Gneiss from igneous rock
__21. Sequence of time in which a mineral crystallizes with respect to other minerals. Important with what it tells about the time and influences of minerals
__22. Foliated metamorphic rock, granite. Compositionally layered metamorphic rock, typically composed of alternating dark-colored and light-colored layers or lenses.
__23. Deposits formed from hot fluids.
d. Flos Ferri
e. Two causes of color
j. Horizon of evaporate
k. Nappes w. Gneiss
Answers to the Quiz: (Don't look at these until you have tried to answer the quiz.)
1. - o, 2. - m, 3. - r, 4. - s, 5. - f, 6. - b, 7. - u, 8. - d, 9. - a, 10. - h, 11. - g, 12. - j,
13. - v, 14. - k, 15. - i, 16. - n, 17. - q, 18. - t, 19. - e, 20. - c, 21. - p, 22. - w, 23. - l