Hoffs Rock Shop: Rock and Mineral specimens

ROCK AND MINERAL SPECIMENS

Chalcedony, probably from Texas. 1 lb. $5

Tan with thin black crust. Unidentified. 13 lbs. $12

8 lb. granite from central MN quarry. Polished on one side. $12

Larvikite from Norway, also known as Swedish blue pearl. About 2.5 lbs. $10

Mary Ellen jasper with good stromatolite patterns. $20

Polished on one side. Red granite, central MN. 30 lbs. $50

Algae jasper. About 2 lbs. $6

Algae jasper. About 2 lbs. $5

This boulder, nearly 100 lbs, is gorgeously striped in carmel and white. $75

Yellow and gray and of unknown origin. 19 lbs. $20

Dimension stone from a central Minnesota quarry. Bluish. $10

Medium blue dimension stone, granitic type. 13 lbs. $20

Bluish granite, from central MN. 11 lbs. $15

Algae jasper with very clear pattern. 13 lbs. $18

I have been asked if this is tigereye. Not it's not but it's beautiful. 70 lbs. $100

Reddish yellow jasper. 10 lbs. $20

Block and unidentified. Pretty color. 30 lbs. $25

Great colors in this algae jasper from the Mary Ellen mine. 30 lbs. $50

20 lbs. fairly nice algae. $25

Five lbs. very nice algae jasper. $10

Mostly gray with some red jasper.$20

Excellent quality algae. 5 lbs. $10

Spectacular algae with visible formations for outdoor decor. 45 lbs. $40

12 lbs. algae jasper. $10

Good algae. 8 lbs. $5

Great focal point for yard decor. Stromatolite. $75

Nice stromatolite. 44lbs. $50

13 lbs. stromatolite. $10

14 lbs. stromatolite. $10

16 lbs. stromatolite. $15

Stromatolite. 8lbs. $8

MN jasper. $30

Unidentified. $5

Unknown and unidentified. 17 lbs.$15

Stromatolite with black spot. 18 lbs. $30

Rock from central MN quarry. 5 lbs. $10

Stromatolite with fairly good pattern. 7.5 lbs. $6

Stromatolite. 54 lbs. Very nice landscaping stone and conversation piece. $70

A fossil rock with a "fault line". 26 lbs. $20

Gem quality or close MN jasper, red, yellow and black. 16 lbs. $25

Jasper and quartz. 14 lbs. $10

Mostly red jasper. 18 lbs. $30

Material from Ely mine, unnamed. About 60 Lb. Sparkly in the sun. $120

17 lbs. mary ellen stromatolite with visible pattern. $30

Mary ellen jasper with good stromatolite pattern. 18 lbs. $30

Ten lbs. mary ellen stromatolite. $15

Mary ellen jasper. 11 lbs. $15

12 lbs. mary ellen jasper. $10

18 lbs mary ellen jasper. $30

From mary ellen mine. 52 lbs. $70

Mary ellen jasper, nice colors. 19 lbs. $35

Minnesota stromatolite. 85 lb. $75

Brown stromatolite boulder. 83 lb. $75

Solid mary ellen jasper. 29 lb. $50

53 lb. stromatolite. $40

Excellent, solid mary ellen. 43 lbs. $110

Beautiful mary ellen jasper, 29 lbs. $100

Blue thunderegg. Origin unknown. $6

One fourth pound chrysocolla. $7

Tree agate from India. Approx. 1 lb. $6

Dense and black with a suggestion of iron content. Approx. 1 lb. $7

Slightly more than a pound of chinese writing stone. $25

Three pieces of pet. wood from NM. Longest is 4". $6

Small sample of banded malachite. $1

Nearly two pounds from Flint Ridge, Ohio. Some druzy, and flat on the bottom so it sits nicely. $7

The specimens below are from Nevada and are various combinations of silver, gold, pyrite, copper, chalcopyrite, turquoise, chrysocolla, cuprite, magnesite, marble, quartz, and perhaps other minerals

2.5"x1.5". Bright green. $30

Lead silver. 3"x2". $30

3"x2.5". $25

2.5" diameter. $20

1 and 3/4"x2 and 3/4". Green-blue and black. $30

3"x1". $20

4"x2". $25

2"x1". What looks like tan on the photo are shades of gold color. $20

3/4 lb. 3"x4". $25

3"x3/4", pointed end. $20

Face of chunk is 3"x2". Green Striped. $2.50

Agate, Heartbreak claim, TN. About a pound. $10

Blue quartz. Color due to microscopic inclusions of fibrous magnesioriebeckite or crocidolite. Roughly a cube, 1.5" sides. $5

Pyrite and gemmy feldspar, Blowing Rock Blvd. Caldwell County, NC. If I can acquire another specimen I would try to vibrolap this. It's beautiful. About 3 lbs. $35

Green amazonite. Roughly cube shaped, about an inch across. Lake George, Colorado. $2

Two "halves" of tan-yellow thunderegg from Tennessee. $5

Amethyst of unknown origin. Good color. 2" diam. approx. $5

Nice cutting material. Unidentified. One half pound. $5

Lazulite from Graves Mountain, Georgia. 1.5 lbs. $40

Rose quartz from Hogg Mine, GA. Is a lighter pink than it photographed but is nicely translucent with some transparency. 3" across. $3

Chalcedony. Arizona. $2

Chrysolite in serpentine. 2"x1.5". Gila County, AZ. $3

Fine grained. Probably siltstone but not sure of the mineral. A little less than 2 lbs. $3

Garnet in matrix. 4"x5" chunk. $60

Striped wood chunk. 3.5"x1.5". $2

Two lbs. South Dakota rose quartz. $9

Four pieces tool making stones, two obsidian and the other two unidentified but possible obsidianite (dacite). About 3" diameter each. $6

Not sure what this is but it's interesting. Dense and shaped like a bone. 3"x2". $5

Volcanic. 2.5"x2". $2

Almandine garnet specimen from Norway. Diameter approx. the size of a nickel. $5

Dravite tourmaline. Bessemer City, NC. 3"x2". $7

Galena, dolomite, quartz. Joplin, MO. $9

Karpholite. This mineral was new to me. Research says recently discovered. Straw colored fibrous silicate. From Germany. 2"x2". $5

Half pound almandite garnet. Have found that the location in Georgia where this was mined is no longer open. $45

Fluorite from NM. 4"x2.5". $10

Sixty five pound piece of steely gray material, striped, from Ely, Minnesota. $60

Picture jasper from mine in Ontario. 25 lbs. $50

Beautiful example of opalized wood, found in a diatemaceous mine in western US. Weighs 3 lbs. $50

Pieces of ore, probably pyrite. $2

Outstanding Canadian amethyst slab, rough on one side and polished on the other. New material. 15"x8". $200

Opal in matrix. Not a lot of opal but definitely shows how it looks in the raw. Australia. $4

Apache tear (obsidian) in perlite matrix. $6

Saddle Mountain wood. $12

Saddle Mountain wood. $9

Selenite chunk, 2"x2.5"x4". $7

Lepidolite from Manitoba. $4

Unidentified. 2 lbs. $2

Unusual granite and basalt northern Minnesota landscaping rock. 2'x1.5'. $30

Quartz. $1.50

Garnet is a hard, good quality stone but it is too common to have much value. The most widely recognizd garnets are red, but it can occur in any color. Some change color in incandescent light. Because it is relatively hard, it is used as an abrasive. Garnets are formed under heat and pressure in metamorphic and sometimes igneous rocks. They can be found in several US states both east and west, Africa, India, Russia and South America. In times past, garnets were exchanged among friends to show affection. Their powers are said to include healing, strength and protection. This is a stone that has been regarded as a gem since the bronze age. It has been the birthstone for January since 1912.

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Picture jasper. $15

Brazil agate. $1

A nodule from Montana with iron and manganese content. 3"x4". $6

amethyst nugget: A piece of Thunder Bay amethyst, deep color, not a lot of flaws. $4.50

Arizona stone: A secondary copper mineral. 2.5x4.5" approx. $2.50

geode: A geode is formed when water runs through cavities in rocks, precipitating out minerals in some places and depositing them in others. Crystals grow from the minerals that line the cavity. This geode is from Mexico. $4.50

iron pyrite: This shiny brassy metal is the classic "fool's gold". $3.50

lace agate specimen: This piece weighs 7 and 1/2 lbs and lies flat for a conversation piece. $24

Thomsonites in basalt matrix. Rare material. Over 30 lbs. $80

picture jasper: Two pound piece, more or less, with nice blue sky. $70

Crazy Horse granite from South Dakota. This didn't photograph very well but it is striking. Semi polish on one side. One can only guess at the metaphysical signifigance. 7 lbs. $35