Mohammad Iskandar Marzuki's Photo Gallery

DWT-ERMOpal SiO₂·nH₂O , Opal (Var: Precious Opal) SiO₂·nH₂O , Opal (Var: Opal-CT) SiO₂·nH₂O

Lebak Regency, Banten Province, Indonesia

Dimensions: 23.6 mm x 16.15 mm x 10.13 mm
Weight: 20.6 carats

Large gemmy 'non-hydrophane' precious opal from deep hole mining in Cikulur, Banten, West Java, Indonesia.

T9Q-52JOpal SiO₂·nH₂O , Opal (Var: Prase Opal) SiO₂·nH₂O , Opal (Var: Opal-CT) SiO₂·nH₂O

Wonogiri Regency, Central Java Province, Indonesia

Dimensions: 35.6 mm x 23 mm x 14 mm
Weight: 9 g

Dark green transparent common opal from the Manggal Hill, Tirtomoyo, Central Java, Indonesia

WVH-HW7Opal SiO₂·nH₂O , Opal (Var: Fire Opal) SiO₂·nH₂O , Opal (Var: Opal-CT) SiO₂·nH₂O

Wonogiri Regency, Central Java Province, Indonesia

Dimensions: 56.6 mm x 38.8 mm x 15.2 mm
Weight: 26 g

Dark reddish orange fire opal from Manggal Hill, Tirtomoyo, Wonogiri, Central Java, Indonesia.

4MD-2VRAmber

Sarawak, Malaysia

Dimensions: 2.8 inches x 2.5 inches x 1.5 inches

Sarawak amber from Middle Late Miocene of Miri formation at Miri highway road cut, Sarawak, Malaysia.

TAN-1QTAmber

Malvern clay pits, Perla, Hot Spring County, Arkansas, USA

52mm long and 12g in weight. (the specimens looks over scale because of its thickness)
Found: Acme Clay pits, Hot Springs Co., Malvern, Arkansas, USA
Geological deposit: lignitic clay (Claiborne Formation)
Age: 40 - 50 million years old ( Lutetian/Eocene)

Polished amber

Merit Block coal deposits, Kapit Division, Sarawak, Malaysia

Dimensions: 24.5 mm x 18.6 mm x 9 mm

Dimension = 24.5mm x 18.6mm x 9mm
15-17 million years old amber from Merit-Pila Coal Mine, Sarawak, Malaysia
Highly polished specimen. Pure amber and nearly opaque.

1TP-LVTAmber

Malvern clay pits, Perla, Hot Spring County, Arkansas, USA

Oval cabochon amber (for scale) dimensions = 18.7mm x 10.7mm x 4.7mm
Raw and polished Arkansas amber from Acme Hot Springs Clay pits, Malvern, Arkansas, USA. Found in the Claiborne Formation (Eocene).

P7U-UDYAmber

Glendive, Dawson County, Montana, USA

Extremely brittle Cretaceous amber from Hell Creek Formation (65-67Ma). Small and jelly beans shaped or spheroid (8.5mm).

Polished Sarawak amber

Merit Block coal deposits, Kapit Division, Sarawak, Malaysia

Dimensions: 20 mm x 15 mm x 6.5 mm

Dimensions: 20mm x 15mm x 6.5mm
Specimens: Borneo amber (var. Sarawak amber)
Toughness: Very tough (varied in each specimens)
Hardness: 2.5 (varied in each specimens)
Crystal: Amorphous
Description: Cut and polished Sarawak amber to shows-up the polished surface luster.
Approximate age: Tertiary/Miocene (15-17 millions years old)

9K8-NJCAmber

Merit Block coal deposits, Kapit Division, Sarawak, Malaysia

(25mm X 11mm X 6mm Rectangular polished Sarawak amber) Translucent-opaque Sarawak amber.
Sarawak amber is the variety of Borneo amber. This amber found at Merit-Pila Coal Mine, Kapit, Sarawak, Malaysia. Dated in 15-17 Ma (or millions years old). There are several types of Sarawak amber including Hard-tough, Brittle and Lignite-amber matrix. They also can be polished like gemstones but cannot hold hi-polished long enough after frequent wearing or handling. Some talented peoples able to made them into jewelry.