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Nakhon Ratchasima (Khorat; Korat; Nakorn Rajsima), Nakhon Ratchasima District, Nakhon Ratchasima Province (Khorat Province), Thailandi
Regional Level Types
Nakhon Ratchasima (Khorat; Korat; Nakorn Rajsima)- not defined -
Nakhon Ratchasima DistrictDistrict
Nakhon Ratchasima Province (Khorat Province)Province

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Latitude & Longitude (WGS84):
14° 58' North , 102° 7' East
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
Nakhon Ratchasima208,781 (2011)1.6km
Non Thai11,959 (2013)25.9km
Chok Chai23,337 (2018)27.0km
Non Sung18,399 (2013)28.1km
Sung Noen14,365 (2012)32.7km

Unnamed borrow pits in unconsolidated sediments near the Royal Thai airbase near Korat city. Started about 1965 during the construction of the US Army Camp Friendship and adjacent Royal Thai airbase. These large, shallow (8-10 feet [2-3 meter] deep) pits uncovered gem gravels and a buried petrified forest with some logs to 1 meter diameter.

C. Lemanski, Jr.

Regions containing this locality

Sunda PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

2 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Formula: SiO2 · nH2O
Colour: White, brown, tan, black
Fluorescence: Green (SW UV).
Description: Occurs replacing wood in smaller logs and as rinds of opalized wood around larger petrified logs.
Reference: C. Lemanski, Jr. (visited, collected & photographed).
Opal var: Opal-Agate
Formula: SiO2 · nH2O
Colour: colorless, white, earth tones, black
Fluorescence: Green (SW UV)
Description: Occurs as pebbles weathered from veins. Displays fine banding exactly like banded agate.
Reference: C. Lemanski, Jr. (visited, collected & photographed).
Opal var: Wood Opal
Formula: SiO2 · nH2O
Colour: White, brown, tan, black
Fluorescence: Green (SW UV).
Description: Occurs replacing wood in smaller logs and as rinds of opalized wood around larger petrified logs.
Reference: C. Lemanski, Jr. (visited, collected & photographed).
'Petrified Wood'
Description: Occurs as the cores of larger petrified logs with opalized wood (Wood Opal) rinds around the edges.
Reference: C. Lemanski, Jr. (visited, collected & photographed).
Formula: SiO2
Reference: C. Lemanski, Jr. (visited, collected & photographed).
Quartz var: Amethyst
Formula: SiO2
Reference: C. Lemanski, Jr. (visited, collected & photographed).
'Tektite var: Indochinite'
Reference: C. Lemanski, Jr. (visited, collected & photographed).

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Opal4.DA.10SiO2 · nH2O
var: Opal-Agate4.DA.10SiO2 · nH2O
var: Wood Opal4.DA.10SiO2 · nH2O
var: Amethyst4.DA.05SiO2
Unclassified Minerals, Rocks, etc.
'Petrified Wood'-
var: Indochinite'

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Mixtures, etc.
var: Opal-Agate-SiO2 · nH2O
var: Wood Opal-SiO2 · nH2O
'Petrified Wood'-
var: Amethyst
var: Indochinite'

List of minerals for each chemical element

H Opal (var: Wood Opal)SiO2 · nH2O
H OpalSiO2 · nH2O
H Opal (var: Opal-Agate)SiO2 · nH2O
O Opal (var: Wood Opal)SiO2 · nH2O
O OpalSiO2 · nH2O
O Opal (var: Opal-Agate)SiO2 · nH2O
O Quartz (var: Amethyst)SiO2
O QuartzSiO2
Si Opal (var: Wood Opal)SiO2 · nH2O
Si OpalSiO2 · nH2O
Si Opal (var: Opal-Agate)SiO2 · nH2O
Si Quartz (var: Amethyst)SiO2
Si QuartzSiO2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

66 - 145 Ma

ID: 3191217
Mesozoic sedimentary rocks

Age: Cretaceous (66 - 145 Ma)

Comments: Khorat Basin

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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