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Yuhuatai gravel bed, Nanjing, Jiangsu, Chinai
Regional Level Types
Yuhuatai gravel bed- not defined -
NanjingPrefecture
JiangsuProvince
ChinaCountry

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Name(s) in local language(s):?, 南京市, 江苏省, 中国
Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 31° North , 118° East (est.)
Margin of Error:~31km
Köppen climate type:Cfa : Humid subtropical climate


Rain flower pebbles or Yuhua stones are historically from Yuhuatai and more recently from Luhe districts of Nanjing. They are all from the Yuhuatai gravel layer, which is an important stratum around Nanjing. This layer was named by geologists Liu Jichen and Zhao Rujun at the 1924 International Geological Congress, and mainly consists of the sediment from the ancient Yangtze River and its tributaries such as the Qinhuai and the Chuhe. The layer was deposited gradually 12 to 3 million years ago, and is mainly distributed across the Yuhuatai District and its surrounding areas such as Luhe, Yizheng (Jiangsu Province, 仪征), Jiangning (江宁) and so forth. The gravel layer is the complex accumulation that resulted from the repeated overlapping and mixing of multiple sources of sediments from different eras, with a thickness ranging from several meters to hundreds of meters.

However, only this layer is home to Yuhua stones. Much like anything carvable gets called Jade in China, any pretty pebble from this gravel layer is called a Yuhua stone and recently you can get tumble polished stones of any kind from anywhere called Yuhua stones. The interesting mineralization in this gravel bed are the agate pebbles. The real origin of the agates is from vulcanism far up the Yangtse River about a hundred million years ago. The original deposit up river has never been found and may have weathered totally away leaving this gravel bed as the only remaining agate source in the lower reaches of the Yangtze River, around Nanjing. The flow here is slow allowing the nomadic stones to gradually deposit, forming the Yuhuaitai gravel layer, together with rocks from other regions and native gravel.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


1 valid mineral.

Detailed Mineral List:

Quartz
Formula: SiO2
Habit: Water worn pebbles
Colour: Some agates are very colourful showing a full spectrum.
Description: Water worn colorful pebbles to several cm were called Yuhua stones since the beginning of the sixth century. Then the Gods were so impressed with the eloquence of a monk that they rained down these Rain Flower Pebbles
Reference: Rob Woodside collection
Quartz var: Agate
Habit: Water worn pebbles
Colour: Some agates are very colourful showing a full spectrum.
Description: Water worn colorful pebbles to several cm were called Yuhua stones since the beginning of the sixth century. Then the Gods were so impressed with the eloquence of a monk that they rained down these Rain Flower Pebbles
Reference: Rob Woodside collection
Quartz var: Chalcedony
Formula: SiO2
Habit: Water worn pebbles
Colour: Some agates are very colourful showing a full spectrum.
Description: Water worn colorful pebbles to several cm were called Yuhua stones since the beginning of the sixth century. Then the Gods were so impressed with the eloquence of a monk that they rained down these Rain Flower Pebbles
Reference: Rob Woodside collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Agate4.DA.05SiO2
var: Chalcedony4.DA.05SiO2

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
var: Agate-SiO2
var: Chalcedony-SiO2

List of minerals for each chemical element

OOxygen
O Quartz (var: Chalcedony)SiO2
O QuartzSiO2
SiSilicon
Si Quartz (var: Chalcedony)SiO2
Si QuartzSiO2

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