University of Northern Iowa

Petrology

The study of the origin, chemistry, distribution, and structure of rocks.

Displaying 1 - 100 of 1437
Cat. # Name Description
1 00.3.3.648.0001 Ore, silver None
2 00.3.6.217.0006 Coal Bituminous.
3 1991.38.1.0008 Taconite Ore bearing. Color: GY
4 00.3.15.312.0003 Dendrites On chert.
5 00.3.15.303.0004 Sandstone None
6 00.3.4.5.0001 Silver None
7 00.3.10.185.0006 Marble Polished.
8 1970.47.1.0332 unk Unlabelled.
9 00.3.15.350.0001 Sandstone None
10 00.3.5.143.0005 Geode Iron stained lining.
11 1987.3.0049 Agate Water level agate; polished.
12 00.3.13.513.0011 Shale None
13 00.3.3.681.0001 Geyserite Geyser eggs of calcite.
14 00.3.7.397.0001 Porphyritic None
15 2006.15.0002 Obsidian, Snowflake 67 gram snowflake obsidian specimen with several well developed pea-sized crystals visible Color: BK WH
16 00.3.15.328.0007 Limestone Shell breccia and semioolitic limestone..
17 00.3.5.106.0007 Quartz, geode None
18 00.3.11.243.0006 Granite Coarse-grained.
19 1970.47.1.0455 Galena Unlabelled.
20 00.3.11.258.0002 Leucite None
21 00.3.6.206.0011 Copper Purple copper, erubescite in barite.
22 1990.53.0141 unk None
23 00.3.15.292.0006 Trap None
24 00.3.4.21.0005 Lead and zinc Galena-Blende and pyrite.
25 00.3.9.70.0011 Zinc ore Calamine.
26 00.3.10.153.0003 Geode, calcite None
27 00.3.15.339.0004 Shale None
28 00.3.11.248.0014 Granite None
29 00.3.11.272.0003 Limestone Crystalline (Marble).
30 00.3.23.709.0001 Anorthosite None
31 00.3.3.648.0002 Ore, silver Native silver 90%.
32 1991.38.1.0009 Taconite Alabaster Color: WH
33 00.3.15.303.0006 Sandstone Fine-grained.
34 00.3.4.5.0003 Silver None
35 00.3.10.185.0007 Marble None
36 1970.47.1.0333 Concretion Unlabelled.
37 00.3.15.350.0003 Grit None
38 00.3.5.143.0006 Chyrsoprase Var. chrysoprase.
39 1987.3.0091 Agate Chrysoprase.
40 00.3.13.513.0014 unk None
41 00.3.3.681.0003 Limestone Cale sinter.
42 00.3.7.397.0005 Pexwood Feldspathic.
43 2006.15.0003 Quartz Agate 150 gram quartz agate. One side is polished flat, the other shows the growth of fine quartz crystals. Surrounded by brown, white and pink crystals. Color: PK WH BR
44 00.3.15.329.0002 Argillite Kintla argillite interbedded with quartzite. Color: GR,RD
45 00.3.5.106.0014 Quartz, rose None
46 00.3.11.243.0009 Granitoid None
47 1970.47.1.0456 Galena Unlabelled.
48 00.3.11.258.0003 Breccia Andesite.
49 00.3.23.699.0012 Limestone Rectangular.
50 1990.53.0146 Bauxite None
51 00.3.15.293.0001 Concretion Clay-ironstone.
52 00.3.4.21.0007 Silver and lead
53 00.3.9.70.0013 Soapstone, serpentine None
54 00.3.10.165.0005 Chalk None
55 00.3.15.339.0005 Shale None
56 00.3.11.249.0001 Trap None
57 00.3.11.272.0004 Limestone Encrinal limestone.
58 00.3.23.709.0003 unk None
59 00.3.3.648.0003 Ore, silver Black silver.
60 1991.38.1.0012 Fire clay Color: GY-WH
61 00.3.15.304.0002 Clay Concretion with calcite veins within a marcasite pand..
62 00.3.4.5.0004 Silver None
63 00.3.10.186.0006 Marble None
64 1970.47.1.0350 Schist Small.
65 00.3.15.350.0004 Sandstone None
66 1987.3.0114 Taconite None
67 00.3.13.513.0015 unk None
68 00.3.3.683.0002 Geyserite Geyser formation.
69 00.3.7.397.0007 Schist None
70 2006.15.0004 Agate 564 gram angular agate geode centered around purple and white quartz crystals. Color: BR PR CL
71 00.3.15.329.0006 Limestone Siyeh limestone above the Grinnell 4,000 feet.
72 00.3.5.109.0004 Geode None
73 00.3.11.243.0010 Granite Biotite granite.
74 1970.47.1.0457 Galena Unlabelled.
75 00.3.11.258.0004 Epidosite None
76 00.3.23.699.0013 Rock None
77 00.3.6.206.0013 Ore Copper
78 1990.53.0147 Bauxite None
79 00.3.15.293.0002 Concretion Clay concretion with calcitic veins within a marcasite band.
80 00.3.4.22.0011 Lead , silver?
81 00.3.9.71.0002 Soapstone Soapstone - steatite.
82 00.3.10.166.0004 Sinter Calcareous sinter.
83 00.3.15.340.0005 Sand Siliceous sand vein.
84 00.3.11.249.0003 Glaucophane Massive.
85 00.3.11.272.0005 Limestone, w/Hornblende ? In limestone.
86 00.3.3.648.0004 Ore, silver Black silver.
87 1991.38.1.0013 Tufa, calcareous Calcareous tufa - travertine. Color: PK
88 00.3.15.304.0007 Concretion In clay concretion.
89 00.3.4.5.0005 Silver None
90 00.3.10.186.0012 Marble Variegated.
91 1970.47.1.0407 Zinc and copper ore None
92 00.3.15.350.0005 Sandstone None
93 00.3.5.143.0011 Agate Agate--Jasper.
94 00.3.13.513.0016 unk None
95 00.3.3.684.0003 Tufa, calcareous None
96 00.3.7.397.0008 Schist None
97 1976.0037 Concretion Limestone pyrite concretion.
98 2006.15.0046 Obsidian Small in size specimen of Obsidian, uneven ridges, one smooth face, dull to vitreous luster, 5-6 on hardness scale, mineraliod Color: Black
99 00.3.15.329.0009 unk Catalog called this Amygdaloid and extrusive flow about 200 feet above the base of the kintta.
100 00.3.5.111.0009 Chalcedony None
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