Cinnabar

Object/Artifact

-

Crater Rock Museum

Cinnabar

Cinnabar

Name/Title

Cinnabar

Entry/Object ID

2014.1.32

Description

Chemical Composition: Al(OH)3 Crystal System: Hexagonal System Description: Common Name: Cinnabar Chemistry: HgS Group: Sulfides Location: California Description: Small rocky specimen with pinkish linear crystals. Matrix is brown and gray. Physical Charateristics: Color is a bright scarlet or cinnamon red to a brick red. •Luster is adamantine to submetallic in darker specimens. •Transparency crystals are translucent to transparent. •Crystal System is trigonal; 32 •Crystal Habits: individual, well formed, large crystals are scarce; crusts and crystal complexes are more common; may be massive, or in capilary needles. Crystals that are found tend to be the six sided trigonal scalahedrons that appear to have opposing three sided pyramids. It also forms modified rhombohedrons, prismatic and twinned crystals as discribed above. •Cleavage is perfect in three directions, forming prisms. •Fracture is uneven to splintery. •Hardness is 2 - 2.5. •Specific Gravity is approximately 8.1+ (very heavy for a non-metallic mineral) •Streak is red •Associated Minerals are realgar, pyrite, dolomite, quartz, stibnite and mercury. •Other Characteristics: silghtly sectile and crystals can be striated. •Notable Occurances include Almaden, Spain; Idria, Serbia; Hunan Prov., China and California, Oregon, Texas, and Arkansas, USA. •Best Field Indicators are crystal habit, density, cleavage, softness and color. 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

1-1/4 in

Length

2 in

Location

Location

Shelf

CS-I-2

Room

Curation Storage

Building

Crater Rock Museum

Date

January 31, 2024

Location

Shelf

2nd shelf

Cabinet

Case# 20

Wall

West

Building

Freida Smith Hall

Category

Permanent