Name/Title
Calcite on ConichalciteEntry/Object ID
2014.1.57Description
Chemical Composition: Al(OH)3
Crystal System: Hexagonal System
Description: Common Name: Malachite / Calcite
Chemistry: CaCO3
Group: Carbonates
Location: Mexico
Description: Small specimen with one side having a pale pink crystalline structure. Matrix has some green areas with pale pinks throughout.
Physical Charateristics:
Color is red to pink.
• Luster is vitreous.
• Transparency crystals are transparent to translucent.
• Crystal System is trigonal; bar 3 2/m
• Crystal Habits include rhombohedrons and scalahedrons, but large crystals are rare. Often, any large crystals are sphaerocobaltite intergrown with calcite, coloring the whole crystal pink. Also botryoidal, globular, stalactitic and as crusts.
• Cleavage is perfect in three directions, forming rhombohedrons.
• Fracture is uneven.
• Hardness is 4.
• Specific Gravity is approximately 4.2 (above average for translucent minerals).
• Streak is pale pink.
• Associated Minerals are calcite, malachite, cobaltite and dolomite.
• Other Characteristics: red or pink and white banding in massive forms and effervesces easily with dilute acids.
• Notable Occurrences include Shaba, Zaire; Saxony Germany and from other secondary cobalt ore locations.
• Best Field Indicators are color, crystal habit, reaction to acid, associations with cobalt ore deposits, and cleavage.
Hardness: 7 Quartz
Rock Type: SedimentaryCollection
RAGM Mineral CollectionAcquisition
Accession
2014.1Source or Donor
Crater Rock Museum (unknown donors)Acquisition Method
GiftOther Names and Numbers
Other Number
Other Number: 78.63.28Dimensions
Height
2-3/4 inWidth
1-1/4 inLength
2-11/16 inLocation
Location
Display Case
FS-11Room
Frieda Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Curtis GardnerDate
May 25, 2023Notes
Added current locationLocation
Shelf
2nd RowCabinet
Case# 20Wall
WestBuilding
Freida Smith HallCategory
Permanent
