Rock Collecting Tour of the Eastern and
Central
Upper Peninsula of Michigan
In the Upper Peninsula rock exposures may be found in every
county - sandstones in northern Chippewa and limestones in the southern part of the county;
limestones, some gypsum, and shale in Mackinac; sandstones in Luce,
Alger, Marquette, Baraga, Keweenaw, Ontonagon, Gogebic, Dickinson and
Iron; limestones in Menominee, Dickinson, Delta and Schoolcraft
counties. The igneous and metamorphic rocks, with their wealth of
copper, silver, and iron ore, crop out to make the wild and
picturesque scenery and the gorges of Keweenaw, Houghton, Marquette,
Dickinson, Baraga, Iron, Ontonagon and Gogebic counties as well as
the highest peaks in the State-the Huron and Porcupine mountains. In
the dumps and rock piles of the mines, minerals and rocks from far
underground may be found.
Throughout your tour of the Upper Peninsula you will want to
look for Lake Superior agates, found on the shore of Lake Superior,
especially after storms. Besides their inherent hardness and fine
luster, concentric banding (eastern Upper Peninsula and the Keweenaw)
is a definite clue to the identity of specimens. Agates feel waxy to
the touch.
If you walk on private property along the Lake Superior beach,
you should obtain permission of the property owner. His rights extend
to the water's edge, regardless of water level fluctuations.
Permission is not required, however, if you wade in the water, just
off the beach. Submerged bottomlands of the Great Lakes are open to
the public.
Starting at the Straits of Mackinac your route turns westward.
Stop at Pointe Aux Chenes about ten miles west of St. Ignace. Look in
piles of stone along the highway. You may find some mottled brown and
white gypsum or some beautiful specimens of very fine needle-like
crystals with a satiny luster. This variety of gypsum is called satin
spar.
If you have time it would be worth while to make a side trip to
a quarry about nine miles east of Trout Lake where excellent and
abundant samples of chert and flint can be obtained. Chert and flint
can also be obtained in the old quarries at Manistique if your route
is along the northern shore of Lake Michigan.
Tours of the Upper Peninsula often take the vacationer by one
route and return him by another. If you go first by the route along
Lake Superior, stop in the Whitefish Point area and
check the beaches for agates. Banded agates can be found in the
Eastern U.P., especially in places such as the beaches of Paradise
and Whitefish Point and the beaches north of Newberry (food and lodging).
Excellent specimens of "bog iron" ore, limonite, can be found
about three-quarters of a mile south of Seney and also along the
highway west of Seney, (Food and
Lodging) near the Seney National
Wildlife Refuge.
At Marquette you enter the iron-mining district and the region
of igneous and metamorphic, or the crystalline rocks which make up
the western half of the Upper Peninsula. Veins of green epidote, an
inch or more in width, show in the granite cuts of Sugar Loaf
Mountain a few miles northwest of Marquette and in the granite
outcrop near the Dead River Bridge not far from the ore docks in
Marquette.
Nearly two billion years ago, the area west of Marquette was
very likely as high as the Alps. The rocks you see along the
lakeshore are part of the eroded roots of a mountain system similar
to alpine-type mountains. Geologists speculate that this region may
even have been as high as the present-day Himalaya Mountains, the
tallest peaks in the world.
In the Marquette area, at the Superior Mine and the Jackson
Mine Locations, you should fine druses of Goethite.
When you're in Marquette, go northwest on Presque Isle Avenue
to the end. At the point you will find agate, fortification (Lake
Superior); Calcite; Chalcedony geodes to 5" in diameter and
Jasper.
At Ishpeming (Food and
Lodging) you really get into the "mineral country." Beautiful
light green talc, a very soft greasy-feeling mineral, can be obtained
near the Ropes Gold Mine, a few miles north of Ishpeming. At the same
locality, serpentine, a much harder dark green mineral, that may be
streaked with white dolomite, can be found. Mixtures of serpentine
and dolomite, calcite or talc are known as "verde antique marble".
Vein quartz is abundant at the Michigan Gold Mine a few miles west
and north of Ishpeming.
Some fragments of quartz contain tourmaline, a black shiny
mineral in long needle-like crystals. Other minerals such as barite,
a white platy heavy mineral, and manganese-bearing minerals such as
pyrolusite, manganite, and psilomelane, can be collected near
Ishpeming. Specimens of iron ore, hematite, can be obtained at any
mine.
"Jasper Hill," in Ishpeming, is a convenient place from which
to obtain specimens of beautifully banded jasper and specular
hematite, known as jaspilite. Be sure to see Jasper Knob, the worlds
largest gemstone which is composed completely of jaspilite. Jaspilite
probably creates the most beautiful and interesting rock formations
in the entire state of Michigan.
In the Ishpeming area, there are several old mine sites that
will attract your attention.
- At the abandoned old Lake Shaft, specimens of
Chlorastrolite (Greenstone), hematite, jasper and quartz may be
found.
- At the abandoned Section Seven Mine in Ishpeming you should
see Chlorastrolite (aka Greenstone); Hematite; Hematite, specular;
Jasper; Limonite; Magnetite; and Quartz.
- At the Holmes Mine, there are specimens of Calcite: cavity
fillings in hematite; Hematite, specular, some with jasper;
Jasper; Limonite; Magnetite; Quartz, rock, ferruginous, with
jasper.
- At the Lindberg Quarries near Ishpeming you may see
Dolomite, red, pink, orange, or brown with black lacelike edges.
- Also in the Ishpeming area at the Section Sixteen Mine,
look for Calcite: concretions on hematite; Hematite, grape,
kidney, massive, needle, stalactic; Jasper; Limonite; Pyrite;
Quartz, rock, small crystals; Steatite (Soapstone).
While still in Ishpeming, take SR-28 and Division Street
through the city then turn right at the foot of Jasper Hill. You will
see Hematite; Red Jasper, and Jaspilite.
For the Ropes Gold Mine, go west from Ishpeming on US-41 to
Cooper Lake Road, turn right and go 2.5 miles, left on CR-572 for
less than 1 mile, walk 0.3 mile to Ropes Gold Mine. You will also see
Serpentine here.
In Negaunee a monument has been erected marking the place where
the Jackson Mining Company discovered iron ore in 1845, the year
following the first discovery of iron ore in the Upper Peninsula
(September 19, 1844). The monument is made of every kind of rock,
ore, and mineral found in the Iron Country.
In the Negaunee area, stop at the Baltic Mine dump for massive
Rhodochrosite, check at the Cambria Mine for Hematite, kidney,
massive, specular and Steatite (Soap stone).
Also in the Negaunee area at the Lucy Mine, search for Barite,
nice crystals; Manganite, metallic gray-black in blocky crystal
clusters.
After leaving the Ishpeming-Negaunee area, take highway M-95 to Republic, eight miles south of
Champion. (Lodging) This trip may
add several minerals to the collection. Specular hematite and
magnetite are abundant on the old mine dumps. You may find
crystallized quartz in openings in the specularite, and occasional
crystals of staurolite in a light-colored mica schist. Good specimens
of feldspar can be found at several places. A lead-colored, soft,
foliated (in scales or leaves) mineral, molybdenite, has been found
in quartz veins near Republic, but it is in too small amounts to make
a search for it really worth while.
In the Republic area you should also find Beryl, Red Jasper,
Jaspilite and Tourmaline.
Your next stop should be at Champion. (Lodging for the Champion and
Republic mine sites) On the old rock piles on Beacon Hill a
number of minerals can be obtained. Specular hematite, a variety
composed of thin, very lustrous, scales of hematite closely pressed
together, is the type of iron ore found at this locality. Magnetite
is abundant and dark red garnet crystals are partially embedded in
lumps of magnetite. Long, slender interlaced prisms of black
tourmaline have also formed on the magnetite. Tourmaline crystals,
when broken, show a spherical triangular cross section, that is, the
prisms have three sides but the sides are curved. Fine parallel lines
are on the long prism faces. Be sure to pick up fragments of quartz
from the Champion rock piles. In many of these quartz crystals you
will see slender prisms of tourmaline. A brown mineral with cleavage
like that of calcite is occasionally found at Champion. This is
siderite, a carbonate of iron. At the Champion Mine, it is possible
to find sapphire and sericite.
Head for the Athens mine near Champion. There the red and dark
brown of the heaps of iron ore minerals are in striking contrast to
the yellow and buff surface clays, once the deposits on the bed of an
old glacial lake. The red mineral is hematite. Some hematite is
dense, hard, and crystallized in long fibers. Masses of large fibers
are known as "pencil ore." Some crystals arrange themselves in oddly
shaped masses of concretions know as kidney ore. Some hematite is
soft, as you will find when your clothing is soiled if you are not
careful how you handle the powdery, non-lustrous ore. Goethite, a
brown iron mineral that is really hematite plus water, may be found
in beautiful orthorhombic crystals in cavities. Nearby is another
dark brown mineral, never found in crystals. It is known as limonite.
It may not be a separate distinct mineral but a fine-grained
goethite.
Now take a short side trip through the village of Michigamme,
cross the bridge at Michigamme Beach and follow the road on the south
side of Lake Michigamme for about one and one-half miles. You will
see a rock-cut on the north side of the road in which the
dark-colored schist rock has a pimply appearance due to small
crystals of staurolite which are harder than the body of the rock and
stand out in relief as the rock is worn by wind and weather. The
staurolite can he easily recognized because so many specimens have
two crystals crossed (twinned) to form an X.
Garnet may be found in the Michigamme area at the Mount Shasta
mine.
Should you return from the Upper Peninsula by way of the
Southern Route (U.S. 2) attractive mineral specimens can be obtained
in the marble quarries at Randville and Felch in Dickinson County (Lodging). Slender
white satiny-looking prisms of tremolite and grass-green blades of
actinolite are found in the white crystalline dolomitic marble. At
Felch a pink feldspar can be obtained from a dike rock which cuts
across the marble. Where the dike is in contact with the marble,
brown and blackish serpentine is found.
The Iron County mine rock piles have Hematite and Specularite.
The mines are near Amasa, Crystal Falls, Iron River, Mineral Hills
and Stambaugh.
Much of this information is from Rocks and Minerals of Michigan
By O. F. Poindexter, H. M. Martin and S. G. Bergquist, Michigan
Department of Natural Resources, 1971 and
Earth Treasures, (Vol 1: The Northeastern Quadrant) by Allan W.
Eckert, Harper Row Publishers, 1987.
Rock Collecting in
the Upper Peninsula of Michigan
Rock Collecting Tour
of the Western Upper Peninsula - the Copper Country
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