Hemimorphite

Object/Artifact

-

Crater Rock Museum

Name/Title

Hemimorphite

Entry/Object ID

2004.1.156

Description

Chemical Composition: Zn4 Si2 O7 (OH)2 -H2O Crystal System: Orthorhombic System Description: Common Name: Hemimorphite Group Name: Chemistry: Zn4 Si2 O7 (OH)2 -H2O Location: Description: Vast expanse of mini-crystals on one side; burnt-brown cavity with some crystals on opposite side. PHYSICAL CHARACTERISTICS: Color is blue-green, green, white, colorless, brown and yellow. Luster is vitreous in large crystals to dull in more compact forms. Transparency crystals are transparent to translucent. Crystal System is orthorhombic; mm2 Crystal Habits include the bladed crystal form and the botryoidal form as the most common. The crystals are usually elongated and flat. The terminations are different at each end. One termination is blunted by a pedion face that is usually bevelled by several dome faces. The other end is pointed, being capped by a pyramid. The other common form is botryoidal producing a grape bunch texture. Often the botryoidal form has a cock's comb appearance showing rough crystal terminations. Cleavage is perfect in one direction. Fracture is conchoidal to subconchoidal. Hardness is slightly less than 5. Specific Gravity is approximately 3.4+ (above average) Streak is white. Associated Minerals include limonite, aurichalcite, calcite and smithsonite. Other Characteristics: strongly pyroelectric and piezoelectric. Best Field Indicators are crystal habit, color, density and luster. Fracture: conchoidal Hardness: 5 Apatite Luster: Vitreous Occurrence: Notable Occurrences include Santa Eulalia and Mapimi, Mexico; New Mexico and New Jersey, USA: England and Zambia. Specific Gravity: 3.4 Streak: White Variety: Hemimorphite is one of the more common sorosilicates.

Collection

Suomynona Mineral Collection

Acquisition

Accession

2004.1

Source or Donor

Suomynona Mineral Collection

Acquisition Method

Donation

Dimensions

Width

6-1/2 in

Depth

7 in

Length

14 in

Dimension Notes

Dimension taken at widest points

Location

Location

Room

Neil Johnson

Building

Attic Storage

Category

Permanent

Moved By

Lehman R.

Date

August 28, 2009

Location

Drawer

Center

Shelf

Top Shelf

Cabinet

FL9

Wall

North

Building

Founders Room

Category

Permanent