Marble - Colorado Geological Survey

More documents

Recommendations

Info

(67) Quartzite, dark greenish gray 5 G 4/1, fine grained with stringers of light greenish gray 5 G 8/1 fine crystalline quartz. Rock is apparently nearly pure quartz and possibly owes it greenish color to minor finely disseminated chlorite; chlorite crystals were not seen. Limonite stains are present on one edge of sample. (Sample not digested.) (68) Marble, dark gray N3, fine crystalline with tightly interlocked calcite crystals from 0.1 to 0.5 mm across. Crystals are same color as hand specimen owing to presence of ca. 1-2 percent organic impurities and very minor less than 0.1 percent magnetite contained within the crystals. Rock shows excellent resistance to disaggregation and on weathered surface shows little staining. (69) Marble, medium gray N5 with bands ranging up to very light gray N8, coarse crystalline with crystals ranging from 1.0-4.0 mm across. Calcite crystals are tightly interlocked. Lighter bands contain 1 to 2 percent slightly oxidized magnetite and very minor less than 0.1 percent pyrite. Darker N5 areas contain very minor ca. 0.1 percent iron minerals. Crystal color is same as hand specimen owing to less than 1 percent organic impurities contained within crystals. Rock shows good resistance to disaggregation on fresh surfaces and poor resistance where weathered. (70) Marble as (69) except larger crystals range upwards to 6 mm across and the magne tite is oxidized to hematite/limonite resulting on a 2.5 YR 4/8 red splotchy staining in the otherwise near white bands. 71) Marble, medium gray N5 coarse crystalline with calcite crystals from 1.0 to 2.0 mm across with calcite crystals tightly interlocked. Calcite crystals are the same color as hand specimen owing to organic impurities and clay making up less than 1.0 percent of them. Very minor less than 0.1 percent magnetite and pyrite. An unidentified dark yellowish orange 10 YR 6/6 mineral, possibly sphene, forms less than 0.1 percent of the rock. Stubby, prismatic crystals 0.2-0.5 mm across do not disaggregate or oxidize to stain or deteriorate adjacent calcite crystals. Rock exhibits good resistance to disaggregation except on weathered surface(s). (72) Metaquartzite, hydrothermal ironsulfide mineralized. Protolith of rock probably is a quartz sandstone with a small amount of clay or a quartz porphyry intrusive. Rock consists of veinlets of finely disseminated crystalline pyrite and minor magnetite? in a matrix y N9 near white five grained crystalline quartz. Biotite and phlogopite ? are distributed in small 0.5 mm masses throughout the rock. Estimated percentages of minerals are quartz 75 percent pyrite 15 percent, biotite/phlogopite ? 9+ percent, other undetermined constituents 1 percent. Note: There is a very small amount 0.1 percent of a soft jade-green mineral that was not determined.
50 APPENDIX B ASTM Test Procedures and Results for Colorado Highland Marble ASTM Test Procedures intentionally omitted from this report
Page 1 and 2:
CGS LII Open-File Report 90-2 Geolo
Page 4 and 5: EXECUTIVE SUMMARY *. .....1 INTRODU
Page 6 and 7: The Colorado Geological Survey (CGS
Page 8 and 9: night can be more pronounced in win
Page 10 and 11: GEOLOGIC CHARACTERIZATION INVESTIGA
Page 12 and 13: content. A Geometries GS 101A scint
Page 14 and 15: ock unit known as the Molas Formati
Page 16 and 17: contain galena, sphalerite, and cha
Page 18 and 19: 6? J® •—y "iff i &-m*--&-.~s I
Page 20 and 21: EXPLANATION Upper Tertiary volcanic
Page 22 and 23: closing of the Midnight Mine near R
Page 24 and 25: o o o o o o o o a. o» o o CO o> o
Page 26 and 27: o o o o o o © o OS OS o o 00 OS o
Page 28 and 29: the greatest potential for gold. Th
Page 30 and 31: The economic evaluation for the Col
Page 32 and 33: Country of Origin Italy Spain Greec
Page 34 and 35: quarries, may be nothing more than
Page 36 and 37: White Marble (Pbwm) White marble is
Page 38 and 39: Textbook, Economic Evaluation and I
Page 40 and 41: the end of the year taken. The prod
Page 42 and 43: increase back support costs. A 20 f
Page 44 and 45: The CGS has determined that the occ
Page 46 and 47: Barton, W. R., 1968, Dimension Ston
Page 48 and 49: APPENDIX A Description of Rock Samp
Page 50 and 51: contains inclusions of dark gray cl
Page 52 and 53: dote, is tightly cemented by silica
Page 56 and 57: INDIANA DEPARTMENT OF NATURAL RESOU
Page 58 and 59: DIRS 120 INDIANA DEPARTMENT OF NATU
Page 60 and 61: SKYLINE LABS, INC. SPECIALISTS - EX
Page 62 and 63: SKYLINE LABS, INC. SPECIALISTS IN E
Page 64 and 65: ALLIED ENVIRONMENTAL SERVICES, INC.
Page 66 and 67: Designers Tile and Marble, 1928 Eas
Page 68 and 69: U.S. Bureau of Mines, Washington, D
Page 70 and 71: Title: Four months production Proje
Page 72 and 73: Title: Five month production with T
Page 74 and 75: (Title: Five months production Proj
Page 76 and 77: Title: Six months production with T
Page 78 and 79: Production Calculations Cubic Feet
Page 80 and 81: Tile Blocks Assume: 1) from broken
Page 82 and 83: large samples of geologic material:
show all

Marble - Colorado Geological Survey

Create successful ePaper yourself

Delete template?

Save as template?