Eudialyte

Object/Artifact

-

Crater Rock Museum

Name/Title

Eudialyte

Entry/Object ID

2014.1.55

Description

Chemical Composition: Al(OH)3 Crystal System: Hexagonal System Description: Common Name: Eudialyte Chemistry: Na4(Ca, Ce, Fe, Mn)2ZrSi6O17(OH, Cl)2 Group: Silicates Location: Quebec, Canada Description: Small specimen with dark red crystal structure and some nepheline and quartz intrusions. Physical Charateristics: Color varies from red-violet, pink, blue, yellow and a light brown. • Luster is vitreous. • Transparency: Crystals are translucent to transparent. • Crystal System is trigonal; bar 3 2/m. • Crystal Habit is typically embedded grains and distorted rhombohedral crystals. • Cleavage is poor in one direction (basal). • Fracture is uneven. • Hardness is 5 - 5.5 • Specific Gravity is 2.9 (average) • Streak is white. • Other Characteristics: Crystals tend to be fractured and are somewhat brittle. • Associated Minerals include many rare minerals as well as nepheline, feldspars especially albite, and natrolite, quartz, calcite and aegirine. • Notable Occurrences include Mont Saint-Hilaire, Quebec, Canada; Kola Peninsula, Russia; Kangerdluarsuk and Julianehaab, Greenland; the Langesundfjord region of Norway; Madagascar and Magnet Cove, Arkansas, USA. • Best Field Indicators are lack of crystal habit, association with aegirine, locality, color and hardness. 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

2-1/4 in

Width

1-1/8 in

Length

3-3/4 in

Location

Location

Shelf

CS-I-2

Room

Curation Storage

Building

Crater Rock Museum

Date

January 31, 2024

Location

Shelf

Top Row

Cabinet

Case# 20

Wall

West

Building

Freida Smith Hall

Category

Permanent