Sodalite

Object/Artifact

-

Crater Rock Museum

Name/Title

Sodalite

Entry/Object ID

2014.1.11

Description

Chemical Composition: Al(OH)3 Crystal System: Hexagonal System Description: Common Name: Sodalite Chemistry: Na4Al3(SiO4)3Cl Group: Silicates Location: Unknown Description: This is a rough specimen with irregular shape a blue with white streaks. Physical Charateristics: •Color is blue, white, gray, or even green. •Luster is vitreous or greasy •Transparency: Crystals are transparent to translucent, massive specimens are opaque. •Crystal System: Isometric; bar 4 3/m •Crystal Habits: Dodecahedral crystals have been found, usually massive as a rock forming mineral. •Cleavage is poor, in six directions, but rarely seen. •Fracture is uneven •Hardness is 5.5 - 6.0 •Specific Gravity is 2.1 - 2.3 •Streak white •Associated Minerals calcite, nepheline, cancrinite and other feldspathoids. •Other Characteristics: it is the only feldspathoid to give a positive chlorine test when dissolved in a HNO2 dilute solution. •Notable Occurrences include Bancroft, Ontario; Mt. Vesuvius, Italy; Brazil; Ice River area, British Columbia and Maine, USA. •Best Field Indicators are color if blue, lack of pyrite association (as in lazurite), hardness and associations. Hardness: 7 Quartz Rock Type: Sedimentary

Collection

RAGM Mineral Collection

Acquisition

Accession

2014.1

Source or Donor

Crater Rock Museum (unknown donors)

Acquisition Method

Gift

Dimensions

Height

2-1/2 in

Width

3/4 in

Length

1-3/4 in

Location

Location

Shelf

CS-I-1

Room

Curation Storage

Building

Crater Rock Museum

Date

February 3, 2024

Location

Shelf

5th shelf

Cabinet

Case# 20

Wall

West

Building

Freida Smith Hall

Category

Permanent