Name/Title
Beryl var. EmeraldEntry/Object ID
2004.1.26Description
Assemblage Zone: pegmatite dikes
Chemical Composition: Be3 Al2 Si6 O18
Crystal System: Hexagonal System
Description: Common Name: Beryl var. heliodor
Group Name: Silicates
Chemistry: Be3 Al2 Si6 O18
Location: Coscuez Mine, Columbia
Description: Blue/Green crossing crystals on top of clear crystals.
PHYSICAL CHARACTERISTICS:
VARIETY OF: Beryl , Be3 Al2 Si6 O18 .
USES: Gemstone.
BIRTHSTONE FOR: May
COLOR: various shades of green.
INDEX OF REFRACTION: 1.57 - 1.60
BIREFRINGENCE: 0.004 - 0.008
HARDNESS: 7.5 - 8
CLEAVAGE: one direction, poor.
CRYSTAL SYSTEM: hexagonal
Pleochroic: weak
Fracture: conchoidal
Hardness: 7 Quartz
Luster: Glassy
Occurrence: The wonderful green color of emerald is unparalleled in the gem kingdom. Emerald's precious green color is caused by small amounts of chromium and enhanced by traces of iron. Unlike other beryls, emeralds often contain inclusions and other flaws. These flaws are not looked on as negative aspects for emerald like they would be for other gemstones. Indeed, these flaws are considered part of the character of the stone and are used to assure the purchaser of a natural stone.
Specific Gravity: 2.63-2.80
Streak: White
Variety: Emerald is the green variety of the mineral beryl. Other gemstone color varieties that belong to beryl include aquamarine, morganite, and heliodor. Other colors of beryl are simply refered to by their color, such as red beryl.Collection
Suomynona Mineral Collection, Suomynona CollectionAcquisition
Accession
2004.1Source or Donor
Suomynona Mineral CollectionAcquisition Method
DonationDimensions
Width
3 inDepth
1-1/4 inLength
3-3/4 inWeight
0.41 ozDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
FS-3Room
Frieda Smith HallBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Ian C.Date
January 29, 2025Notes
Major mineral groups installationLocation
Display Case
FS-5Room
Frieda Smith HallBuilding
Crater Rock MuseumDate
January 3, 2024
