US Stamp Gallery >> Browse stamps through the history of the United States


Search by subject, description,
content or year


Home

About

See All US Stamps

Add stamps to
your own website


Stamps through:
1847-1850
1851-1875
1876-1900
1901-1925
1926-1950
1951-1975
1976-2000
2001-2024

Tourmaline
Date Issued: 1974-06-13
Postage Value: 10 cents

Commemorative issue
Mineral heritage
Tourmaline

Complex boron and aluminum silicate minerals, tourmalines form slender, three-, six-, or nine-sided prismatic crystals in parallel or radiating groups. Tourmalines develop an electrical charge when heated or deformed, and slabs cut perpendicular to the long axis can polarize light. The best-developed tourmaline crystals are most commonly found in pegmatite. Crystals also are found in limestone altered by granitic intrusions. Tourmaline is the birthstone for October.

Topic: Science/Scientists (128)  

Back Link to this stamp    Embed this stamp on your website
Browse Stamps through
the history of the United States


African American (259)
Agriculture (65)
Airplane (153)
Animal (601)
Architecture (114)
Art (692)
Asia (1)
Astronomy (10)
Author (158)
Automobile (84)
Baseball (45)
Bird (304)
Boxing (4)
Bridge (32)
Butterflies (34)
Canal (8)
Cats (24)
Children (201)
Christmas (245)
Columbus (31)
Computers (1)
Culture (46)
Dance (34)
Dinosaurs (4)
Dogs (67)
Dolls (23)
Eagle (72)
Entertainment (422)
Explorer (15)
Fish/Fishing (77)
Flag (335)
Flower (491)
Football (40)
Forever Stamp (1002)
Garden (21)
Harry Potter (20)
Hockey (2)
Holocaust (5)
Horse (143)
Industry (13)
Insects (58)
Inventor (39)
Italian Heritage (131)
Landscape (217)
Lighthouses (47)
Lincoln (6)
Lunar New Year (50)
Map (105)
Marine Life (11)
Maritime (5)
Medicine (54)
Military (459)
Movie Industry (180)
Music (191)
Native American (101)
Olympics (123)
Photography (3)
Politics (153)
Portrait (898)
Postal Service (105)
President (287)
Railroad (76)
Red Cross (5)
Religion (56)
Rural (8)
Science/Scientists (127)
Scouting (13)
Ship (185)
Slavery (3)
Soccer (13)
Space (154)
Sport (296)
Stamps on Stamps (26)
Statue of Liberty (26)
Tennis (5)
Trains (1)
Urban (27)
Valentine (4)
Wedding (20)
Wild West (3)
Windmill (7)
Woman (616)
WWII (84)