Laguna Agate

Object/Artifact

-

Crater Rock Museum

Name/Title

Laguna Agate

Entry/Object ID

1986.62.55

Description

Chemical Composition: SiO2 Crystal System: Orthorhombic System Description: Common Name: Quartz var. agate (laguna) Chemistry: SiO2 Group: Silicates Location: Chihuahua, Mexico Description: Rough, rounded back with polished face. Outer area is translucent green, black, brown and smoky gray. Inner area is banded beige, lavender and white with multiple orbicular structures and a single druzy white cavity. PHYSICAL CHARACTERISTICS: Agate ( /'æg?t/) is a microcrystalline variety of silica, chiefly chalcedony, characterized by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks. Fracture: conchoidal Hardness: 7 Quartz Luster: Waxy Rock Type: Sedimentary Specific Gravity: 2.58-2.64 Streak: white Texture: Mircocrystalline

Collection

Mexican Agate Collection

Acquisition

Accession

78.59

Source or Donor

Delmar Smith Agate Collection

Acquisition Method

Gift

Dimensions

Width

4 in

Depth

1-1/4 in

Length

5 in

Dimension Notes

Dimension taken at widest points

Location

Location

Display Case

FS-15

Room

Frieda Smith Hall

Building

Crater Rock Museum

Category

Permanent